update a number of dependencies
update a number of dependencies

keertip/dartdoc,keertip/dartdoc,dart-lang/dartdoc,dart-lang/dartdoc,dart-lang/dartdoc,dart-lang/dartdoc,keertip/dartdoc,astashov/dartdoc,astashov/dartdoc,astashov/dartdoc,astashov/dartdoc,keertip/dartdoc