check if tag is present in stage conditional (#48)

* do not check if branch is master

.travis.yml

@@ -4,8 +4,7 @@ sudo: false
 cache: false
 stages:
   - name: deploy
-    # require the branch name to be master (note for PRs this is the base branch name)
-    if: branch = master AND NOT type IN (pull_request)
+    if: repo = davegallant/rfd AND tag IS present
 
 before_install:
   - pip install -U pip