[android_alarm_manager] Update minimum Flutter version to 1.12.0 (flutter#2327)

bkonyi · Park Sung Min · commit c16af06211e5 · 2019-12-17T23:03:28.000+09:00
diff --git a/packages/android_alarm_manager/pubspec.yaml b/packages/android_alarm_manager/pubspec.yaml
@@ -22,5 +22,4 @@ flutter:
 
 environment:
   sdk: ">=2.0.0-dev.28.0 <3.0.0"
-  # TODO(bkonyi): set minimum Flutter version to next stable release
-  flutter: ">=1.2.0 <2.0.0"
+  flutter: ">=1.12.0 <2.0.0"
