Upgrade to RN 0.55.4

package.json

@@ -64,7 +64,7 @@
     "node-sass": "^4.8.3",
     "prettier-eslint": "^8.8.1",
     "react": "16.3.1",
-    "react-native": "0.55.3",
+    "react-native": "0.55.4",
     "react-native-recyclerview-list": "git+https://github.com/wordpress-mobile/react-native-recyclerview-list.git#bfccbaab6b5954e18f8b0ed441ba38275853b79c",
     "react-redux": "^5.0.7",
     "redux": "^3.7.2",

yarn.lock

@@ -5819,9 +5819,9 @@ react-native-sass-transformer@^1.1.1:
     css-to-react-native-transform "^1.6.0"
     semver "^5.5.0"
 
-[email protected].3:
-  version "0.55.3"
-  resolved "https://registry.yarnpkg.com/react-native/-/react-native-0.55.3.tgz#6ff1691bd0645d0480fba16377edb9dce5bd28c4"
+[email protected].4:
+  version "0.55.4"
+  resolved "https://registry.yarnpkg.com/react-native/-/react-native-0.55.4.tgz#eecffada3750a928e2ddd07cf11d857ae9751c30"
   dependencies:
     absolute-path "^0.0.0"
     art "^0.10.0"