Remove a deprecated option from analysis options (#1744)

bwilkerson · web-flow · commit 24597b670331 · 2018-08-20T21:43:51.000-07:00
diff --git a/analysis_options.yaml b/analysis_options.yaml
@@ -1,6 +1,5 @@
 analyzer:
   language:
-    enablePreviewDart2: true
     enableSuperMixins: true
   exclude:
     - 'doc/**'
