Update dependency react-app-rewired to v2

Author: renovate-bot

package.json

@@ -52,7 +52,7 @@
     "flow-coverage-report": "0.6.0",
     "flow-typed": "2.5.1",
     "prettier": "1.14.2",
-    "react-app-rewired": "1.6.2",
+    "react-app-rewired": "2.1.5",
     "react-test-renderer": "16.5.0",
     "redux-mock-store": "1.5.3",
     "toctoc": "0.3.0"

yarn.lock

@@ -2660,7 +2660,7 @@ [email protected]:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/dotenv-expand/-/dotenv-expand-4.2.0.tgz#def1f1ca5d6059d24a766e587942c21106ce1275"
 
-[email protected], dotenv@^4.0.0:
+[email protected]:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-4.0.0.tgz#864ef1379aced55ce6f95debecdce179f7a0cd1d"
 
@@ -7899,12 +7899,11 @@ [email protected]:
     less-loader "^4.1.0"
     npm "^6.4.1"
 
-react-app-rewired@1.6.2:
-  version "1.6.2"
-  resolved "https://registry.yarnpkg.com/react-app-rewired/-/react-app-rewired-1.6.2.tgz#32ce90abc2c4e2b86c71e4e270bd36663b3b1c9a"
+react-app-rewired@2.1.5:
+  version "2.1.5"
+  resolved "https://registry.yarnpkg.com/react-app-rewired/-/react-app-rewired-2.1.5.tgz#592ec2eae5c3c5cd96c80930b5dc3f6c34da1dc6"
   dependencies:
-    cross-spawn "^5.1.0"
-    dotenv "^4.0.0"
+    semver "^5.6.0"
 
 react-dev-utils@^5.0.2:
   version "5.0.2"
@@ -8708,6 +8707,10 @@ semver-diff@^2.0.0:
   version "5.5.0"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.5.0.tgz#dc4bbc7a6ca9d916dee5d43516f0092b58f7b8ab"
 
+semver@^5.6.0:
+  version "5.7.1"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-5.7.1.tgz#a954f931aeba508d307bbf069eff0c01c96116f7"
+
 semver@~5.3.0:
   version "5.3.0"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.3.0.tgz#9b2ce5d3de02d17c6012ad326aa6b4d0cf54f94f"