Update readme to call out 'dart analyze'
Update readme to call out 'dart analyze'

Change-Id: I75a12d5f78033e0fcd724dac062a1397f56c54a8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/228563
Reviewed-by: Brian Wilkerson <1f7641b6b14c52b9163524ab8d9aabff80176f21@google.com>
Commit-Queue: Brian Wilkerson <1f7641b6b14c52b9163524ab8d9aabff80176f21@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk