release 0.4.0 (#903)

* Update pubspec.yaml

* Null safety support (#893)

* fix: added temporary & env files to .gitignore and updated example/pubspec.yaml

* feat: Migrate library and example project to null-safety

* Update version to 1.0.0-nullsafety.0

* fix: Update flutter-version in workflows

* fix: replace mocktail with mockito

* fix: Replace Future<Null> return types with Future<void>

* version bump, updated changelog

Co-authored-by: Simon Lightfoot <simon@devangels.london>
Co-authored-by: Misir Jafarov <misir.ceferov@gmail.com>

Author: 3 people

CHANGELOG.md

@@ -1,3 +1,6 @@
+# 0.4.0 
+- migrated to null safety
+
 # 0.3.10+1
 - fixed android build
 

pubspec.yaml

@@ -8,7 +8,8 @@ authors:
 - Rafal Wachol <gorudonu@gmail.com>
 - Misir Jafarov <misir@fonibo.com>
 homepage: https://github.com/dart-flitter/flutter_webview_plugin
-version: 1.0.0-nullsafety.0
+version: 0.4.0 
+
 
 environment:
   sdk: '>=2.12.0 <3.0.0'