Update dependency flow-bin to ^0.256.0 (#60)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -51,7 +51,7 @@
     "chai-as-promised": "^7.1.1",
     "eslint-plugin-flowtype": "^5.2.0",
     "fetch-mock": "^9.11.0",
-    "flow-bin": "^0.241.0",
+    "flow-bin": "^0.256.0",
     "jsdom": "^15.1.1",
     "jsdom-global": "^3.0.2",
     "mocha": "^6.2.0",

yarn.lock

@@ -1703,10 +1703,10 @@ flatted@^2.0.0:
   resolved "https://registry.yarnpkg.com/flatted/-/flatted-2.0.2.tgz#4575b21e2bcee7434aa9be662f4b7b5f9c2b5138"
   integrity sha512-r5wGx7YeOwNWNlCA0wQ86zKyDLMQr+/RB8xy74M4hTphfmjlijTSSXGuH8rnvKZnfT9i+75zmd8jcKdMR4O6jA==
 
-flow-bin@^0.241.0:
-  version "0.241.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.241.0.tgz#5feaa98f6c892b5869ec936b46d6ad6d91b664f9"
-  integrity sha512-R1WROxAuWCOF5gMVqVYbb3iUvqP2OQyaYLSrkUxZrLonvjUJeedGx7nv79tdkoB7eRja3kY+/lQ/nbPtkFsqOA==
+flow-bin@^0.256.0:
+  version "0.256.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.256.0.tgz#0cddc3b665b8e9cae34eb5896c8429d0f2961fdf"
+  integrity sha512-ujKn6fRfx9SujbqBLhT/lxFsXRsRDgrot2UuNhw4Z5W3QlVn4teV+7rBhs87FVHSnRvZeFAMKHHYYahWYw5W4w==
 
 forever-agent@~0.6.1:
   version "0.6.1"