Fix typo

Co-authored-by: joebingham-wk <[email protected]>

Author: greglittlefield-wf

.travis.yml

@@ -1,7 +1,7 @@
 language: dart
 
 dart:
-  # We need 2.9.2 this to verify the Chrome MemoryInfo workaround: https://github.com/cleandart/react-dart/pull/280
+  # We need 2.9.2 to verify the Chrome MemoryInfo workaround: https://github.com/cleandart/react-dart/pull/280
   # TODO remove the workaround as well as this config once SDK lower bound is >=2.9.3
   - 2.9.2
   - stable