Update flow-bin to the latest version 🚀 (#1600)

* chore(package): update flow-bin to version 0.117.0

* chore(package): update lockfile yarn.lock

* Fixup flow error

From the [Flow 0.117.0 release notes](https://github.com/facebook/flow/releases/tag/v0.117.0)
> Removed uses of Symbol from libdefs in favor of symbol.

Test plan: `yarn flow`

Co-authored-by: Dandelion Mané <decentralion@dandelion.io>

package.json

@@ -63,7 +63,7 @@
     "eslint-plugin-jsx-a11y": "6.2.3",
     "eslint-plugin-react": "7.16.0",
     "file-loader": "^5.0.2",
-    "flow-bin": "^0.114.0",
+    "flow-bin": "^0.117.0",
     "jest": "^24.8.0",
     "jest-fetch-mock": "^3.0.0",
     "prettier": "1.19.1",

src/core/graph.js

@@ -147,7 +147,7 @@ const COMPAT_INFO = {type: "sourcecred/graph", version: "0.8.0"};
 
 export type Neighbor = {|+node: Node, +edge: Edge|};
 
-export opaque type DirectionT = Symbol;
+export opaque type DirectionT = symbol;
 export const Direction: {|
   +IN: DirectionT,
   +OUT: DirectionT,

yarn.lock

@@ -3738,10 +3738,10 @@ flatted@^2.0.0:
   resolved "https://registry.yarnpkg.com/flatted/-/flatted-2.0.1.tgz#69e57caa8f0eacbc281d2e2cb458d46fdb449e08"
   integrity sha512-a1hQMktqW9Nmqr5aktAux3JMNqaucxGcjtjWnZLHX7yyPCmlSV3M54nGYbqT8K+0GhF3NBgmJCc3ma+WOgX8Jg==
 
-flow-bin@^0.114.0:
-  version "0.114.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.114.0.tgz#9079c5fcdf08fab4db91616f38994e9b7d035842"
-  integrity sha512-hewufX0nbnhemQn5XtJ97nEFNqoBclPBAZ54aY3jKuZJnLpwqB7Doaplet3M26TOh2NchBsU0+lUkM8oVna2VA==
+flow-bin@^0.117.0:
+  version "0.117.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.117.0.tgz#2fd331f476dac31f7dae6ac9b557581ebc84e8ad"
+  integrity sha512-LwDdiApyQsO26ubieaLBcW//K8QNcFR50FSUUDo5roy+2nsvkfRdJa0Qse2De6/2fwBElLDDrc3rrSzvC3hy2Q==
 
 flush-write-stream@^1.0.0:
   version "1.1.1"