[google_maps_flutter_platform_interface] Bump version to make the package publishable. (#2677)

The original author of the plugin published versions 1.0.0 to 1.0.0+5 during his development cycle.

This bumps the plugin to 1.0.1 so we can publish the first non-dev version.
diff --git a/packages/google_maps_flutter/google_maps_flutter_platform_interface/CHANGELOG.md b/packages/google_maps_flutter/google_maps_flutter_platform_interface/CHANGELOG.md
index 0d8803f..54c2ab5 100644
--- a/packages/google_maps_flutter/google_maps_flutter_platform_interface/CHANGELOG.md
+++ b/packages/google_maps_flutter/google_maps_flutter_platform_interface/CHANGELOG.md
@@ -1,3 +1,7 @@
-## 1.0.0
+## 1.0.1
 
-* Initial release.
+* Initial open source release.
+
+## 1.0.0 ... 1.0.0+5
+
+* Development.
diff --git a/packages/google_maps_flutter/google_maps_flutter_platform_interface/pubspec.yaml b/packages/google_maps_flutter/google_maps_flutter_platform_interface/pubspec.yaml
index 2cd840b..346d960 100644
--- a/packages/google_maps_flutter/google_maps_flutter_platform_interface/pubspec.yaml
+++ b/packages/google_maps_flutter/google_maps_flutter_platform_interface/pubspec.yaml
@@ -3,7 +3,7 @@
 homepage: https://github.com/flutter/plugins/tree/master/packages/google_maps_flutter/google_maps_flutter_platform_interface
 # NOTE: We strongly prefer non-breaking changes, even at the expense of a
 # less-clean API. See https://flutter.dev/go/platform-interface-breaking-changes
-version: 1.0.0
+version: 1.0.1
 
 dependencies:
   flutter: