chore(deps): update dependency extract-text-webpack-plugin to v2.0.0-rc.3

Author: renovate[bot]

package.json

@@ -124,7 +124,7 @@
     "cz-conventional-changelog": "3.3.0",
     "exports-loader": "0.7.0",
     "expose-loader": "0.7.5",
-    "extract-text-webpack-plugin": "2.0.0-beta.5",
+    "extract-text-webpack-plugin": "2.0.0-rc.3",
     "file-loader": "0.11.2",
     "form-data": "2.5.1",
     "gh-pages": "0.12.0",