updated environment sdk dependency to be compatible with most recent version of flutter, update version to 0.1.7
diff --git a/packages/flutter_markdown/CHANGELOG.md b/packages/flutter_markdown/CHANGELOG.md
index 4c37166..57d27da 100644
--- a/packages/flutter_markdown/CHANGELOG.md
+++ b/packages/flutter_markdown/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.1.7
+
+* Updated environment sdk constraints
+
 ## 0.1.6
 
 * Updated `markdown` dependency.
diff --git a/packages/flutter_markdown/pubspec.yaml b/packages/flutter_markdown/pubspec.yaml
index 8454a90..fab9c0d 100644
--- a/packages/flutter_markdown/pubspec.yaml
+++ b/packages/flutter_markdown/pubspec.yaml
@@ -2,7 +2,7 @@
 author: Flutter Authors <flutter-dev@googlegroups.com>
 description: A Markdown renderer for Flutter.
 homepage: https://github.com/flutter/flutter_markdown
-version: 0.1.6
+version: 0.1.7
 
 dependencies:
   flutter:
@@ -18,4 +18,4 @@
   mockito: ^3.0.0-alpha+2
 
 environment:
-  sdk: '>=1.19.0 <2.0.0'
+  sdk: '>=2.0.0-dev.58.0 <3.0.0'