Update dependencies to enable Greenkeeper 🌴 (#233)

* chore(package): update dependencies

https://greenkeeper.io/

* cross-env 3 is not compatible to node 0.10

* ignore cross-env

package.json

@@ -12,24 +12,24 @@
     "lib"
   ],
   "devDependencies": {
-    "ava": "^0.16.0",
+    "ava": "^0.17.0",
     "babel-cli": "^6.14.0",
     "babel-eslint": "^7.0.0",
     "babel-helper-fixtures": "^6.9.0",
-    "babel-plugin-istanbul": "^2.0.1",
+    "babel-plugin-istanbul": "^3.0.0",
     "babel-plugin-transform-flow-strip-types": "^6.14.0",
     "babel-preset-es2015": "^6.14.0",
     "babel-preset-stage-0": "^6.5.0",
     "chalk": "^1.1.3",
     "codecov": "^1.0.1",
-    "cross-env": "^2.0.1",
+    "cross-env": "^2.0.0",
     "eslint": "^3.7.1",
-    "eslint-config-babel": "^2.0.1",
-    "eslint-plugin-babel": "^3.3.0",
+    "eslint-config-babel": "^3.0.0",
+    "eslint-plugin-babel": "^4.0.0",
     "eslint-plugin-flowtype": "^2.20.0",
-    "flow-bin": "^0.34.0",
+    "flow-bin": "^0.35.0",
     "lodash": "^4.15.0",
-    "nyc": "^8.1.0",
+    "nyc": "^10.0.0",
     "rimraf": "^2.5.4",
     "rollup": "^0.36.3",
     "rollup-plugin-babel": "^2.6.1",
@@ -59,5 +59,10 @@
     ],
     "sourceMap": false,
     "instrument": false
+  },
+  "greenkeeper": {
+    "ignore": [
+      "cross-env"
+    ]
   }
 }