Update travis-ci configuration

Author: jazzpeh

.travis.yml

@@ -2,12 +2,13 @@ language: node_js
 
 jobs:
   include:
-    - stage: "Tests"                
+    - stage: "Tests"       
+      if: branch = master OR tag IS present
       name: "Unit Tests"  
       node_js: "8"          
       script: "yarn unit"
     - stage: npm release
-      if: branch = master AND type = push
+      if: tag IS present
       node_js: "8"
       script: echo "Deploying to npm ..."
       deploy: