Bump DEPS to 0.1.5.
Bump DEPS to 0.1.5.

Pulls in:

* Added `prefer_is_not_empty` lint rule (#143).
* Added `type_annotate_public_apis` lint rule (#24).
* Added `avoid_as` lint rule (#145).
* Fixed `non_constant_identifier_names` rule to special case underscore identifiers in callbacks.
* Fix to escape `_`s in callback type validation (addresses false positives in `always_specify_types`) (#147).

R=keertip@google.com

Review URL: https://codereview.chromium.org/1434773002 .

dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk