Enable yarn caching in .travis.yml (#1016)
Enable yarn caching in .travis.yml (#1016)


arijs/prettier-with-tabs,lydell/prettier,Pajn/prettier,azz/prettier,Skywalker13/prettier-space-parenthesis,Pajn/prettier,yamafaktory/prettier,azz/prettier,existentialism/prettier,despairblue/prettier,Skywalker13/prettier-space-parenthesis,azz/prettier,arijs/prettier-miscellaneous,lydell/prettier,existentialism/prettier,rattrayalex/prettier,azz/prettier,prettier/prettier,lydell/prettier,prettier/prettier,jlongster/prettier,arijs/prettier-with-tabs,rattrayalex/prettier,Skywalker13/prettier-space-parenthesis,arijs/prettier-miscellaneous,despairblue/prettier,existentialism/prettier,prettier/prettier,prettier/prettier,arijs/prettier-miscellaneous,rattrayalex/prettier,yamafaktory/prettier,Skywalker13/prettier-space-parenthesis,arijs/prettier-miscellaneous,existentialism/prettier,lydell/prettier