chore(package): update @babel/preset-env to version 7.6.3

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
   "homepage": "https://github.com/microstates/react#readme",
   "devDependencies": {
     "@babel/core": "^7.6.4",
-    "@babel/preset-env": "^7.1.0",
+    "@babel/preset-env": "^7.6.3",
     "@babel/preset-react": "7.0.0",
     "@bigtest/interactor": "^0.9.1",
     "@bigtest/react": "^0.1.2",