Updates required for sourcemap generation

package.json

@@ -54,11 +54,11 @@
     "vue": "^2.5.2"
   },
   "devDependencies": {
-    "autoprefixer-loader": "^2.0.0",
+    "autoprefixer-loader": "^3.2.0",
     "babel-cli": "^6.26.0",
     "babel-core": "^6.26.0",
     "babel-helper-vue-jsx-merge-props": "^2.0.3",
-    "babel-loader": "^6.4.1",
+    "babel-loader": "^7.1.3",
     "babel-plugin-dynamic-import-node": "^1.2.0",
     "babel-plugin-syntax-jsx": "^6.18.0",
     "babel-plugin-transform-class-properties": "^6.24.1",
@@ -72,18 +72,18 @@
     "chai": "^3.5.0",
     "compression-webpack-plugin": "^1.1.3",
     "cross-env": "^3.2.4",
-    "css-loader": "^0.23.1",
+    "css-loader": "^0.28.10",
     "eslint": "^3.19.0",
     "eslint-plugin-vue": "^2.1.0",
     "extract-text-webpack-plugin": "^2.1.2",
-    "file-loader": "^0.8.5",
+    "file-loader": "^1.1.11",
     "friendly-errors-webpack-plugin": "^1.6.1",
     "gulp": "^3.9.1",
     "gulp-autoprefixer": "^3.1.1",
     "gulp-clean-css": "^2.0.13",
     "gulp-less": "^3.3.2",
     "gulp-rename": "^1.2.2",
-    "html-loader": "^0.3.0",
+    "html-loader": "^0.5.5",
     "html-webpack-plugin": "^2.30.1",
     "karma": "^1.7.1",
     "karma-chrome-launcher": "^2.2.0",
@@ -94,19 +94,19 @@
     "karma-spec-reporter": "0.0.26",
     "karma-webpack": "^2.0.9",
     "less": "^2.7.3",
-    "less-loader": "^2.2.3",
+    "less-loader": "^4.0.6",
     "lolex": "^1.5.2",
     "mocha": "^3.5.3",
     "sinon": "^3.3.0",
     "sinon-chai": "^2.14.0",
-    "style-loader": "^0.13.1",
-    "url-loader": "^0.5.9",
+    "style-loader": "^0.20.2",
+    "url-loader": "^1.0.1",
     "vue": "^2.5.13",
     "vue-hot-reload-api": "^1.3.3",
-    "vue-html-loader": "^1.2.3",
+    "vue-html-loader": "^1.2.4",
     "vue-loader": "^13.7.0",
     "vue-router": "^2.8.1",
-    "vue-style-loader": "^1.0.0",
+    "vue-style-loader": "^4.0.2",
     "vue-template-compiler": "^2.5.13",
     "webpack": "^3.10.0",
     "webpack-dev-server": "^2.11.1",