chore(package): update babel-preset-env to version 1.6.1 (#4263)

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "babel-eslint": "^8.0.0",
     "babel-plugin-syntax-flow": "6.18.0",
     "babel-plugin-transform-flow-strip-types": "6.22.0",
-    "babel-preset-env": "1.6.0",
+    "babel-preset-env": "1.6.1",
     "babel-preset-es2015": "6.24.1",
     "babel-preset-stage-3": "6.24.1",
     "babel-register": "6.26.0",