Updating bootstrap version (#1520)

- Updates newly generated buffalo apps to use bootstrap 4.2.1 and 3.4.0.
- Removes unused `path` import from our webpack file.

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

@@ -6,9 +6,9 @@
   "repository": "github.com/gobuffalo/buffalo",
   "dependencies": {
     {{ if eq .opts.Bootstrap 3 -}}
-    "bootstrap-sass": "~3.3.7",
+    "bootstrap-sass": "~3.4.0",
     {{ else -}}
-    "bootstrap": "4.1.3",
+    "bootstrap": "4.2.1",
     "popper.js": "^1.14.4",
     {{ end -}}
     "font-awesome": "~4.7.0",
@@ -19,7 +19,7 @@
     "@babel/cli": "^7.0.0",
     "@babel/core": "^7.0.0",
     "@babel/preset-env": "^7.0.0",
-    "babel-loader": "^8.0.0-beta.6",
+    "babel-loader": "^8.0.5",
 
     "css-loader": "~1.0.0",
     "expose-loader": "~0.7.5",

genny/assets/webpack/templates/webpack.config.js.tmpl

@@ -1,6 +1,5 @@
 const Webpack = require("webpack");
 const Glob = require("glob");
-const path = require("path");
 const CopyWebpackPlugin = require("copy-webpack-plugin");
 const MiniCssExtractPlugin = require("mini-css-extract-plugin");
 const ManifestPlugin = require("webpack-manifest-plugin");