upgrade to webpack 4

Author: johnnyreilly

.travis.yml

@@ -7,7 +7,7 @@ install:
   - yarn add $WEBPACK $TSLOADER $VUELOADER -D
 # Test against multiple webpack versions
 env:
-  - WEBPACK=webpack@^4.0.0-beta.3 TSLOADER=ts-loader@^4.0.0-beta.0 VUELOADER=vue-loader@^14.1.0
+  - WEBPACK=webpack@^4.0.0 TSLOADER=ts-loader@^4.0.0 VUELOADER=vue-loader@^14.1.0
   - WEBPACK=webpack@^3.10.0 TSLOADER=ts-loader@^3.4.0 VUELOADER=vue-loader@^13.5.0
   - WEBPACK=webpack@^2.7.0 TSLOADER=ts-loader@^3.4.0 VUELOADER=vue-loader@^13.5.0
 deploy:

package.json

@@ -75,7 +75,7 @@
     "vue-class-component": "^6.1.1",
     "vue-loader": "^14.1.0",
     "vue-template-compiler": "^2.5.9",
-    "webpack": "^4.0.0-beta.3"
+    "webpack": "^4.0.0"
   },
   "peerDependencies": {
     "tslint": "^4.0.0 || ^5.0.0",

yarn.lock

@@ -4255,7 +4255,7 @@ webpack-sources@^1.0.1, webpack-sources@^1.1.0:
     source-list-map "^2.0.0"
     source-map "~0.6.1"
 
-webpack@^4.0.0-beta.3:
+webpack@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.0.0.tgz#423c2d27cb050e7655c6ea25ce27bfcbfcb56731"
   dependencies: