optimize PNGs with optipng
diff --git a/lib/about_logo.png b/lib/about_logo.png
index f46b94e..c080f05 100644
--- a/lib/about_logo.png
+++ b/lib/about_logo.png
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diff --git a/lib/ali_connors.png b/lib/ali_connors.png
index 671af92..4c0c2ac 100644
--- a/lib/ali_connors.png
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diff --git a/lib/ali_connors_sml.png b/lib/ali_connors_sml.png
index f1b4d16..4a066aa 100644
--- a/lib/ali_connors_sml.png
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diff --git a/lib/appbar/appbar_background_layer0.png b/lib/appbar/appbar_background_layer0.png
index c0870be..ae334bd 100644
--- a/lib/appbar/appbar_background_layer0.png
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diff --git a/lib/appbar/appbar_background_layer1.png b/lib/appbar/appbar_background_layer1.png
index fdda489..900324f 100644
--- a/lib/appbar/appbar_background_layer1.png
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diff --git a/lib/appbar/appbar_background_layer2.png b/lib/appbar/appbar_background_layer2.png
index cae2f45..00ce8a4 100644
--- a/lib/appbar/appbar_background_layer2.png
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diff --git a/lib/appbar/appbar_background_layer3.png b/lib/appbar/appbar_background_layer3.png
index 08906a3..eead9ef 100644
--- a/lib/appbar/appbar_background_layer3.png
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diff --git a/lib/appbar/appbar_background_layer4.png b/lib/appbar/appbar_background_layer4.png
index 3d8a83e..b8fe800 100644
--- a/lib/appbar/appbar_background_layer4.png
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diff --git a/lib/appbar/appbar_background_layer5.png b/lib/appbar/appbar_background_layer5.png
index 92cc89e..b9675fd 100644
--- a/lib/appbar/appbar_background_layer5.png
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diff --git a/lib/drawer_logo.png b/lib/drawer_logo.png
index 13ba452..a5b9af1 100644
--- a/lib/drawer_logo.png
+++ b/lib/drawer_logo.png
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diff --git a/lib/fitness_demo/jumpingjack.png b/lib/fitness_demo/jumpingjack.png
index 61f4bad..e7bded6 100644
--- a/lib/fitness_demo/jumpingjack.png
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diff --git a/lib/kangaroo_valley_safari.png b/lib/kangaroo_valley_safari.png
index 374dc83..5071cf5 100644
--- a/lib/kangaroo_valley_safari.png
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diff --git a/lib/logo/logo_hdpi.png b/lib/logo/logo_hdpi.png
index a429c28..77e1e64 100644
--- a/lib/logo/logo_hdpi.png
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diff --git a/lib/logo/logo_ldpi.png b/lib/logo/logo_ldpi.png
index 85b0edd..f0f2778 100644
--- a/lib/logo/logo_ldpi.png
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diff --git a/lib/logo/logo_mdpi.png b/lib/logo/logo_mdpi.png
index 4758b7c..0473b39 100644
--- a/lib/logo/logo_mdpi.png
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diff --git a/lib/logo/logo_xhdpi.png b/lib/logo/logo_xhdpi.png
index 36fc087..20ae731 100644
--- a/lib/logo/logo_xhdpi.png
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diff --git a/lib/pesto/fish.png b/lib/pesto/fish.png
index 2d36c5c..43b7f08 100644
--- a/lib/pesto/fish.png
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diff --git a/lib/pesto/healthy.png b/lib/pesto/healthy.png
index 1b5fef4..8fbbf49 100644
--- a/lib/pesto/healthy.png
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diff --git a/lib/pesto/logo_big.png b/lib/pesto/logo_big.png
index c7e1c88..437cf13 100644
--- a/lib/pesto/logo_big.png
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diff --git a/lib/pesto/logo_medium.png b/lib/pesto/logo_medium.png
index 41b44a1..d4c6579 100644
--- a/lib/pesto/logo_medium.png
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diff --git a/lib/pesto/logo_small.png b/lib/pesto/logo_small.png
index 09ca284..f41fbb8 100644
--- a/lib/pesto/logo_small.png
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diff --git a/lib/pesto/main.png b/lib/pesto/main.png
index 3c51334..c65d819 100644
--- a/lib/pesto/main.png
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diff --git a/lib/pesto/meat.png b/lib/pesto/meat.png
index 6ba1f63..89ae4b4 100644
--- a/lib/pesto/meat.png
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diff --git a/lib/pesto/quick.png b/lib/pesto/quick.png
index c312c56..c5728dc 100644
--- a/lib/pesto/quick.png
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diff --git a/lib/pesto/spicy.png b/lib/pesto/spicy.png
index 793eef9..d3ecd61 100644
--- a/lib/pesto/spicy.png
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diff --git a/lib/pesto/veggie.png b/lib/pesto/veggie.png
index 8c5f72f..b826733 100644
--- a/lib/pesto/veggie.png
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diff --git a/lib/shrine/products/chair.png b/lib/shrine/products/chair.png
index 22ab3cb..f38efc2 100644
--- a/lib/shrine/products/chair.png
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diff --git a/lib/shrine/products/lawn_chair.png b/lib/shrine/products/lawn_chair.png
index 5546616..76594d0 100644
--- a/lib/shrine/products/lawn_chair.png
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diff --git a/lib/shrine/vendors/peter-carlsson.png b/lib/shrine/vendors/peter-carlsson.png
index b702431..8264f02 100644
--- a/lib/shrine/vendors/peter-carlsson.png
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diff --git a/lib/top_10_australian_beaches.png b/lib/top_10_australian_beaches.png
index 2b8496f..84f27d6 100644
--- a/lib/top_10_australian_beaches.png
+++ b/lib/top_10_australian_beaches.png
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diff --git a/lib/weather_demo/clouds-0.png b/lib/weather_demo/clouds-0.png
index e804021..c3ad0ed 100644
--- a/lib/weather_demo/clouds-0.png
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diff --git a/lib/weather_demo/clouds-1.png b/lib/weather_demo/clouds-1.png
index c72e99b..d5bd524 100644
--- a/lib/weather_demo/clouds-1.png
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diff --git a/lib/weather_demo/icon-snow.png b/lib/weather_demo/icon-snow.png
index 3415d3c..a26988e 100644
--- a/lib/weather_demo/icon-snow.png
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diff --git a/lib/weather_demo/icon-sun.png b/lib/weather_demo/icon-sun.png
index 2d0a6bd..a93f885 100644
--- a/lib/weather_demo/icon-sun.png
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diff --git a/lib/weather_demo/ray.png b/lib/weather_demo/ray.png
index 97d3de6..8d17a87 100644
--- a/lib/weather_demo/ray.png
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diff --git a/lib/weather_demo/sun.png b/lib/weather_demo/sun.png
index f1a029d..984a488 100644
--- a/lib/weather_demo/sun.png
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diff --git a/lib/weather_demo/weathersprites.png b/lib/weather_demo/weathersprites.png
index db82135..00b125e 100644
--- a/lib/weather_demo/weathersprites.png
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