Update babel monorepo to v7.8.7

Author: renovate-bot

package.json

@@ -35,9 +35,9 @@
     "@aureooms/js-itertools": "3.4.0",
     "@aureooms/js-number": "3.1.0",
     "@babel/cli": "7.8.4",
-    "@babel/core": "7.8.6",
-    "@babel/polyfill": "7.8.3",
-    "@babel/preset-env": "7.8.6",
+    "@babel/core": "7.8.7",
+    "@babel/polyfill": "7.8.7",
+    "@babel/preset-env": "7.8.7",
     "@babel/register": "7.8.6",
     "ava": "2.4.0",
     "codeclimate-test-reporter": "0.5.1",