Remove unused dev dependency

Author: philipp-spiess

package.json

@@ -23,8 +23,7 @@
     "microbundle": "^0.4.4",
     "prettier": "^1.13.4",
     "react": "^16.4.0",
-    "react-dom": "^16.4.0",
-    "react-test-renderer": "^16.4.0"
+    "react-dom": "^16.4.0"
   },
   "peerDependencies": {
     "react": "^16.4.0"

yarn.lock

@@ -3816,19 +3816,6 @@ react-dom@^16.4.0:
     object-assign "^4.1.1"
     prop-types "^15.6.0"
 
-react-is@^16.4.0:
-  version "16.4.0"
-  resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.4.0.tgz#cc9fdc855ac34d2e7d9d2eb7059bbc240d35ffcf"
-
-react-test-renderer@^16.4.0:
-  version "16.4.0"
-  resolved "https://registry.yarnpkg.com/react-test-renderer/-/react-test-renderer-16.4.0.tgz#0dbe0e24263e94e1830c7afb1f403707fad313a3"
-  dependencies:
-    fbjs "^0.8.16"
-    object-assign "^4.1.1"
-    prop-types "^15.6.0"
-    react-is "^16.4.0"
-
 react@^16.4.0:
   version "16.4.0"
   resolved "https://registry.yarnpkg.com/react/-/react-16.4.0.tgz#402c2db83335336fba1962c08b98c6272617d585"