Add flutter_export_environment.sh to .gitignore (#11)

Author: winksaville

.gitignore

@@ -9,3 +9,4 @@ build/
 **/ios/.generated/
 **/ios/Flutter/Generated.xcconfig
 **/ios/Runner/GeneratedPluginRegistrant.*
+**/ios/Flutter/flutter_export_environment.sh

charts_flutter_cf/CHANGELOG.md

@@ -1,6 +1,7 @@
 # 0.10.2+1
 
 * Fix issue #8 "An assert in LayoutConfig.getMinPixel fires sometimes" with PR #10
+* Add flutter_export_environment.sh to .gitignore
 
 # 0.10.2
 * Try again, forgot to add homepage to sed script for pubspec.