address review comments
address review comments

sdtwigg/rules_scala,sdtwigg/rules_scala,bazelbuild/rules_scala,ianoc/rules_scala,smparkes/rules_scala,ianoc/rules_scala,bazelbuild/rules_scala,ianoc/rules_scala,smparkes/rules_scala,sdtwigg/rules_scala,smparkes/rules_scala,bazelbuild/rules_scala