Use opensource context (#3)

Author: CelestineKao

.circleci/config.yml

@@ -45,13 +45,15 @@ workflows:
   pull_request:
     jobs:
       - test:
+          context: opensource
           filters:
             branches:
               ignore:
                 - master
   publish:
     jobs:
       - publish:
+          context: opensource
           filters:
             tags:
               only: /v[0-9]+(\.[0-9]+)*/