Update Flow to 0.104 (#2057)

.flowconfig

@@ -27,6 +27,9 @@ inexact-spread=error
 implicit-inexact-object=error
 unnecessary-optional-chain=error
 unnecessary-invariant=off
+signature-verification-failure=error
+uninitialized-instance-property=off
+non-array-spread=error
 
 [options]
 include_warnings=true
@@ -35,4 +38,5 @@ suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(<VERSION>\\)?)\\)
 suppress_comment=\\(.\\|\n\\)*\\$DisableFlowOnNegativeTest
 
 [version]
-^0.102.0
+^0.104.0
+

package.json

@@ -52,7 +52,7 @@
     "chai": "4.2.0",
     "eslint": "5.16.0",
     "eslint-plugin-flowtype": "3.12.1",
-    "flow-bin": "0.102.0",
+    "flow-bin": "0.104.0",
     "mocha": "6.2.0",
     "nyc": "14.1.1",
     "prettier": "1.18.2"

src/polyfills/flatMap.js

@@ -9,7 +9,6 @@ declare function flatMap<T, U>(
 // $FlowFixMe
 const flatMap = Array.prototype.flatMap
   ? function(list, fn) {
-      // $FlowFixMe
       return Array.prototype.flatMap.call(list, fn);
     }
   : function(list, fn) {

yarn.lock

@@ -1299,10 +1299,10 @@ flatted@^2.0.0:
   resolved "https://registry.yarnpkg.com/flatted/-/flatted-2.0.1.tgz#69e57caa8f0eacbc281d2e2cb458d46fdb449e08"
   integrity sha512-a1hQMktqW9Nmqr5aktAux3JMNqaucxGcjtjWnZLHX7yyPCmlSV3M54nGYbqT8K+0GhF3NBgmJCc3ma+WOgX8Jg==
 
-flow-bin@0.102.0:
-  version "0.102.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.102.0.tgz#3d5de44bcc26d26585e932b3201988b766f9b380"
-  integrity sha512-mYon6noeLO0Q5SbiWULLQeM1L96iuXnRtYMd47j3bEWXAwUW9EnwNWcn+cZg/jC/Dg4Wj/jnkdTDEuFtbeu1ww==
+flow-bin@0.104.0:
+  version "0.104.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.104.0.tgz#ef5b3600dfd36abe191a87d19f66e481bad2e235"
+  integrity sha512-EZXRRmf7m7ET5Lcnwm/I/T8G3d427Bq34vmO3qIlRcPIYloGuVoqRCwjaeezLRDntHkdciagAKbhJ+NTbDjnkw==
 
 foreground-child@^1.5.6:
   version "1.5.6"