Update babel monorepo to v7.4.4 (#57)

Author: renovate[bot]

package.json

@@ -27,12 +27,12 @@
   },
   "dependencies": {},
   "devDependencies": {
-    "@babel/cli": "7.4.3",
-    "@babel/core": "7.4.3",
+    "@babel/cli": "7.4.4",
+    "@babel/core": "7.4.4",
     "@babel/plugin-proposal-async-generator-functions": "7.2.0",
-    "@babel/polyfill": "7.4.3",
-    "@babel/preset-env": "7.4.3",
-    "@babel/register": "7.4.0",
+    "@babel/polyfill": "7.4.4",
+    "@babel/preset-env": "7.4.4",
+    "@babel/register": "7.4.4",
     "ava": "1.4.1",
     "coveralls": "3.0.3",
     "esdoc": "1.1.0",