Added commands for testing webpacks 3 and 4

.travis.yml

@@ -1,13 +1,11 @@
 language: node_js
 node_js: node
 env:
-  - WEBPACK_VERSION="[email protected]"
-  - WEBPACK_VERSION="[email protected]"
 install:
   - npm install
 script:
-  - npm install $WEBPACK_VERSION
-  - npm test # The pretest hook runs a build
+  - npm run test3 # The pretest hook runs a build
+  - npm run test4
 before_deploy:
   - mv .gitignore-deploy .gitignore
 deploy:
@@ -17,5 +15,4 @@ deploy:
   api_key: "$NPM_API_KEY"
   on:
     branch: deploy
-    tags: true
-    condition: $WEBPACK_VERSION = "[email protected]" # Only deploy once
+    tags: true

package.json

@@ -6,6 +6,8 @@
   "scripts": {
     "build": "babel -d dist src",
     "test": "mocha --require babel-register",
+    "test3": "npm install [email protected] && npm run test",
+    "test4": "npm install [email protected] && npm run test",
     "pretest": "npm run build"
   },
   "repository": {