Upgrade to support flow 0.61 (#1158)

Author: leebyron

.flowconfig

@@ -12,4 +12,4 @@
 experimental.const_params=true
 
 [version]
-^0.60.0
+^0.61.0

package.json

@@ -64,7 +64,7 @@
     "eslint-plugin-babel": "4.1.2",
     "eslint-plugin-flowtype": "2.35.0",
     "eslint-plugin-prettier": "^2.3.1",
-    "flow-bin": "0.60.0",
+    "flow-bin": "0.61.0",
     "isparta": "4.0.0",
     "mocha": "3.5.0",
     "prettier": "^1.8.2",

yarn.lock

@@ -1299,9 +1299,9 @@ flat-cache@^1.2.1:
     graceful-fs "^4.1.2"
     write "^0.2.1"
 
-flow-bin@0.60.0:
-  version "0.60.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.60.0.tgz#885d0d92a90f94c29445e0f9a0382f5b5debaaed"
+flow-bin@0.61.0:
+  version "0.61.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.61.0.tgz#d0473a8c35dbbf4de573823f4932124397d32d35"
 
 for-in@^1.0.1:
   version "1.0.2"