upgrading babel to remove npm warnings

generators/assets/webpack/templates/dot-babelrc.tmpl

@@ -1,3 +1,3 @@
 {
-  "presets": ["env"]
+  "presets": ["@babel/preset-env"]
 }

generators/assets/webpack/templates/package.json.tmpl

@@ -8,21 +8,21 @@
     {{ if eq .opts.Bootstrap 3 -}}
     "bootstrap-sass": "~3.3.7",
     {{ else -}}
-    "bootstrap": "4.1.1",
+    "bootstrap": "4.1.3",
     "popper.js": "^1.14.3",
     {{ end -}}
     "font-awesome": "~4.7.0",
     "jquery": "~3.2.1",
     "jquery-ujs": "~1.2.2"
   },
   "devDependencies": {
-    "babel-cli": "~6.26.0",
-    "babel-core": "~6.26.0",
-    "babel-loader": "~7.1.2",
-    "babel-preset-env": "~1.5.2",
+    "@babel/cli": "^7.0.0",
+    "@babel/core": "^7.0.0",
+    "@babel/preset-env": "^7.0.0",
+    "babel-loader": "^8.0.0-beta.6", 
     "webpack-clean-obsolete-chunks": "^0.4.0",
     "copy-webpack-plugin": "~4.5.1",
-    "css-loader": "~0.28.11",
+    "css-loader": "~1.0.0",
     "expose-loader": "~0.7.5",
     "file-loader": "~1.1.11",
     "gopherjs-loader": "^0.0.1",
@@ -34,7 +34,7 @@
     "uglifyjs-webpack-plugin": "~1.2.4",
     "url-loader": "~1.0.1",
     "webpack": "~4.5.0",
-    "webpack-cli": "2.0.14",
+    "webpack-cli": "3.1.0",
     "webpack-livereload-plugin":"2.1.1",
     "webpack-manifest-plugin": "~2.0.0"
   }