Update dependencies (particularly Babel)

Author: jakezatecky

.babelrc

@@ -1,11 +1,15 @@
 {
   "presets": [
-    "react",
-    ["env", {
+    "@babel/preset-react",
+    ["@babel/preset-env", {
       "targets": {
         "browsers": ["last 2 versions"]
       }
-    }],
-    "stage-2"
+    }]
+  ],
+  "plugins": [
+    ["@babel/plugin-proposal-class-properties", {
+      "loose": false
+    }]
   ]
 }

gulpfile.js

@@ -30,7 +30,7 @@ gulp.task('test-mocha', ['test-script-format'], () => (
     gulp.src(['./test/**/*.js'])
         .pipe(mocha({
             require: [
-                'babel-register',
+                '@babel/register',
                 './test/setup.js',
             ],
         }))

package.json

@@ -28,12 +28,13 @@
     "react": "^15.3.0 || ^16.0.0"
   },
   "devDependencies": {
-    "babel-core": "^6.13.2",
-    "babel-eslint": "^8.0.0",
-    "babel-loader": "^7.0.0",
-    "babel-preset-env": "^1.6.0",
-    "babel-preset-react": "^6.11.1",
-    "babel-preset-stage-2": "^6.5.0",
+    "@babel/core": "^7.0.0",
+    "@babel/plugin-proposal-class-properties": "^7.0.0",
+    "@babel/preset-env": "^7.0.0",
+    "@babel/preset-react": "^7.0.0",
+    "@babel/register": "^7.0.0",
+    "babel-eslint": "^9.0.0",
+    "babel-loader": "^8.0.0",
     "browser-sync": "^2.18.6",
     "chai": "^4.0.0",
     "enzyme": "^3.0.0",
@@ -45,13 +46,13 @@
     "eslint-plugin-jsx-a11y": "^6.0.2",
     "eslint-plugin-react": "^7.10.0",
     "gulp": "^3.9.1",
-    "gulp-autoprefixer": "^5.0.0",
+    "gulp-autoprefixer": "^6.0.0",
     "gulp-eslint": "^5.0.0",
     "gulp-header": "^2.0.5",
     "gulp-mocha": "^6.0.0",
     "gulp-sass": "^4.0.1",
-    "gulp-scss-lint": "^0.6.1",
-    "jsdom": "^11.0.0",
+    "gulp-scss-lint": "^0.7.0",
+    "jsdom": "^12.0.0",
     "mocha": "^5.0.5",
     "react": "^16.0.0",
     "react-dom": "^16.0.0",