Update dependencies

package.json

@@ -41,12 +41,13 @@
   "dependencies": {
     "pbf": "3.1.0",
     "pixelworks": "1.1.0",
-    "rbush": "2.0.2"
+    "rbush": "2.0.2",
+    "uglifyjs-webpack-plugin": "^1.2.5"
   },
   "devDependencies": {
     "babel-core": "^6.26.3",
-    "babel-minify-webpack-plugin": "^0.3.0",
     "babel-plugin-jsdoc-closure": "1.5.1",
+    "chaikin-smooth": "^1.0.4",
     "clean-css-cli": "4.1.11",
     "copy-webpack-plugin": "^4.4.1",
     "coveralls": "3.0.1",
@@ -67,7 +68,8 @@
     "karma-firefox-launcher": "^1.1.0",
     "karma-mocha": "1.3.0",
     "karma-sauce-launcher": "1.2.0",
-    "karma-webpack": "3.0.0",
+    "karma-sourcemap-loader": "^0.3.7",
+    "karma-webpack": "4.0.0-beta.0",
     "marked": "0.4.0",
     "mocha": "5.2.0",
     "mustache": "^2.3.0",
@@ -80,13 +82,12 @@
     "rollup-plugin-node-resolve": "3.3.0",
     "rollup-plugin-sourcemaps": "0.4.2",
     "rollup-plugin-uglify": "4.0.0",
-    "serve": "^8.0.0",
+    "serve": "^8.1.1",
     "sinon": "^5.0.1",
     "url-polyfill": "^1.0.13",
     "walk": "^2.3.9",
-    "webpack": "^4.0.0",
-    "webpack-cli": "^2.0.9",
-    "webpack-sources": "^1.1.0"
+    "webpack": "4.12.0",
+    "webpack-cli": "^3.0.3"
   },
   "eslintConfig": {
     "extends": "openlayers"