Update babel monorepo to v7.8.4

Author: renovate-bot

package.json

@@ -34,10 +34,10 @@
     "@aureooms/js-functools": "2.0.3",
     "@aureooms/js-itertools": "3.4.0",
     "@aureooms/js-number": "3.1.0",
-    "@babel/cli": "7.8.3",
-    "@babel/core": "7.8.3",
+    "@babel/cli": "7.8.4",
+    "@babel/core": "7.8.4",
     "@babel/polyfill": "7.8.3",
-    "@babel/preset-env": "7.8.3",
+    "@babel/preset-env": "7.8.4",
     "@babel/register": "7.8.3",
     "ava": "2.4.0",
     "codeclimate-test-reporter": "0.5.1",