Merge pull request #52 from Workiva/batch/raise_min_dart_sdk_2_19/webdev_proxy

raise_min_dart_sdk_2_19

Author: rmconsole4-wk

pubspec.yaml

@@ -8,7 +8,7 @@ description: >
   routing by rewriting 404s to the root index.
 
 environment:
-  sdk: '>=2.18.0 <3.0.0'
+  sdk: '>=2.19.0 <3.0.0'
 
 dependencies:
   args: ^2.3.1