⬆️ Update dev dependencies

package.json

@@ -1,6 +1,6 @@
 {
   "name": "vue-chartjs",
-  "version": "2.3.7",
+  "version": "2.3.8",
   "description": "vue.js wrapper for chart.js",
   "author": "Jakub Juszczak <jakub@nextindex.de>",
   "repository": {
@@ -33,16 +33,16 @@
     "vue": "^2.2.1"
   },
   "devDependencies": {
-    "babel-core": "^6.10.4",
-    "babel-loader": "^6.0.0",
-    "babel-plugin-transform-runtime": "^6.12.0",
-    "babel-preset-es2015": "^6.0.0",
-    "babel-preset-stage-2": "^6.0.0",
+    "babel-core": "^6.23.1",
+    "babel-loader": "^6.3.2",
+    "babel-plugin-transform-runtime": "^6.23.0",
+    "babel-preset-es2015": "^6.22.0",
+    "babel-preset-stage-2": "^6.22.0",
     "chai": "^3.5.0",
     "chromedriver": "^2.21.2",
     "connect-history-api-fallback": "^1.1.0",
     "cross-spawn": "^5.0.1",
-    "css-loader": "^0.26.1",
+    "css-loader": "^0.26.2",
     "eslint": "^3.7.1",
     "eslint-config-standard": "^6.2.0",
     "eslint-friendly-formatter": "^2.0.5",
@@ -55,7 +55,7 @@
     "extract-text-webpack-plugin": "^1.0.1",
     "file-loader": "^0.9.0",
     "function-bind": "^1.0.2",
-    "html-webpack-plugin": "^2.8.1",
+    "html-webpack-plugin": "^2.28.0",
     "http-proxy-middleware": "^0.17.2",
     "inject-loader": "^3.0.0-beta2",
     "isparta-loader": "^2.0.0",
@@ -80,7 +80,7 @@
     "shelljs": "^0.7.4",
     "sinon": "^1.17.3",
     "sinon-chai": "^2.8.0",
-    "url-loader": "^0.5.7",
+    "url-loader": "^0.5.8",
     "vue-hot-reload-api": "^2.0.11",
     "vue-html-loader": "^1.2.4",
     "vue-loader": "^11.1.3",