Bump @babel/preset-env from 7.7.4 to 7.7.6 (#418)

Bump @babel/preset-env from 7.7.4 to 7.7.6

package.json

@@ -68,7 +68,7 @@
   "main": "dist/js/tabler.js",
   "homepage": "https://tabler.io",
   "devDependencies": {
-    "@babel/preset-env": "7.7.4",
+    "@babel/preset-env": "7.7.6",
     "browser-sync": "2.26.7",
     "bundlesize": "0.18.0",
     "clean-css-cli": "4.3.0",