test: temporarily run providers test alone

.travis.yml

@@ -23,7 +23,7 @@ services:
 script:
 - npm run build
 - npm run test
-- '{ if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then npm run test:acceptance; fi } || true'
+- '{ if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then npm run test:acceptance -- --suite providers; fi } || true'
 - npm run uploadcdn
 env:
   global: