Ensure on master, and that upstream is pointed at master (#146)

Ensure upstream pointed at master for releases

Author: zephraph

.travis.yml

@@ -21,8 +21,8 @@ before_deploy:
   - git config --local user.email "${GIT_EMAIL}"
   - git remote rm origin
   - git remote add origin https://${GH_USER}:${GH_TOKEN}@github.com/relay-tools/relay-compiler-language-typescript.git
-  - git pull origin master
-  - git branch --set-upstream-to origin/master
+  - git checkout master && git pull origin master
+  - git branch --set-upstream-to origin/master master
   - yarn build
 deploy:
   skip_cleanup: true