Upgrade Project (#128)

**- Summary**
- upgrade to babel 7
- upgrade to eslint 5 (removed invalid rules too)
- updated other dependencies

**- Description for the changelog**

build: update dependencies

.babelrc

@@ -1,7 +1,9 @@
 {
-  "presets": ["env"],
+  "presets": [
+    "@babel/preset-env"
+  ],
   "plugins": [
-    "syntax-object-rest-spread",
-    "transform-object-rest-spread"
+    "@babel/plugin-syntax-object-rest-spread",
+    "@babel/plugin-proposal-object-rest-spread"
   ]
 }

.eslintrc.yml

@@ -3,25 +3,10 @@ env:
 
 parser: babel-eslint
 
-plugins: [ "import" ]
+parserOptions:
+  ecmaVersion": 6
 
-# enable ECMAScript features
-ecmaFeatures:
-  arrowFunctions: true
-  binaryLiterals: true
-  blockBindings: true
-  classes: true
-  defaultParams: true
-  destructuring: true
-  forOf: true
-  generators: true
-  jsx: true
-  modules: true
-  objectLiteralShorthandMethods: true
-  objectLiteralShorthandProperties: true
-  octalLiterals: true
-  spread: true
-  templateStrings: true
+plugins: [ "import" ]
 
 rules:
   # Possible Errors

gulpfile.babel.js

@@ -6,7 +6,7 @@ import pluginError from "plugin-error";
 import flatten from "gulp-flatten";
 import postcss from "gulp-postcss";
 import cssImport from "postcss-import";
-import cssnext from "postcss-cssnext";
+import postcssPresetEnv from "postcss-preset-env";
 import BrowserSync from "browser-sync";
 import webpack from "webpack";
 import webpackConfig from "./webpack.conf";
@@ -32,7 +32,7 @@ gulp.task("build-preview", ["css", "js", "fonts"], (cb) => buildSite(cb, hugoArg
 // Compile CSS with PostCSS
 gulp.task("css", () => (
   gulp.src("./src/css/*.css")
-    .pipe(postcss([cssImport({from: "./src/css/main.css"}), cssnext()]))
+    .pipe(postcss([cssImport({from: "./src/css/main.css"}), postcssPresetEnv()]))
     .pipe(gulp.dest("./dist/css"))
     .pipe(browserSync.stream())
 ));

package.json

@@ -14,36 +14,36 @@
   },
   "author": "",
   "license": "MIT",
-  "dependencies": {
-    "babel-core": "^6.26.0",
-    "babel-eslint": "^8.2.3",
-    "babel-loader": "^7.1.4",
-    "babel-plugin-syntax-object-rest-spread": "^6.13.0",
-    "babel-plugin-transform-class-properties": "^6.10.2",
-    "babel-plugin-transform-object-assign": "^6.8.0",
-    "babel-plugin-transform-object-rest-spread": "^6.8.0",
-    "babel-preset-env": "^1.6.1",
-    "babel-register": "^6.11.6",
-    "browser-sync": "^2.23.7",
-    "css-loader": "^1.0.0",
-    "eslint": "^4.19.1",
-    "eslint-plugin-import": "^2.11.0",
+  "devDependencies": {
+    "@babel/core": "^7.1.2",
+    "@babel/plugin-proposal-class-properties": "^7.1.0",
+    "@babel/plugin-proposal-object-rest-spread": "^7.0.0",
+    "@babel/plugin-syntax-object-rest-spread": "^7.0.0",
+    "@babel/plugin-transform-object-assign": "^7.0.0",
+    "@babel/preset-env": "^7.1.0",
+    "@babel/register": "^7.0.0",
+    "babel-eslint": "^10.0.1",
+    "babel-loader": "^8.0.4",
+    "browser-sync": "^2.26.3",
+    "css-loader": "^1.0.1",
+    "eslint": "^5.8.0",
+    "eslint-plugin-import": "^2.14.0",
     "exports-loader": "^0.7.0",
     "fancy-log": "^1.3.2",
     "file-loader": "^2.0.0",
     "gulp": "^3.9.1",
-    "gulp-babel": "^7.0.1",
+    "gulp-babel": "^8.0.0",
     "gulp-flatten": "^0.4.0",
-    "gulp-postcss": "^7.0.1",
-    "gulp-watch": "^5.0.0",
-    "hugo-bin": "^0.30.0",
+    "gulp-postcss": "^8.0.0",
+    "gulp-watch": "^5.0.1",
+    "hugo-bin": "^0.37.0",
     "imports-loader": "^0.8.0",
     "plugin-error": "^1.0.1",
-    "postcss-cssnext": "^3.1.0",
-    "postcss-import": "^12.0.0",
-    "url-loader": "^1.0.1",
-    "webpack": "4.17.1",
-    "whatwg-fetch": "^2.0.4"
+    "postcss-preset-env": "^6.3.0",
+    "postcss-import": "^12.0.1",
+    "url-loader": "^1.1.2",
+    "webpack": "4.23.1",
+    "whatwg-fetch": "^3.0.0"
   },
   "resolutions": {
     "natives": "1.1.3"