chore(package): update file-loader to version 6.0.0

Closes #30

Author: greenkeeper[bot]

package.json

@@ -58,7 +58,7 @@
     "eslint-plugin-jsx-a11y": "^6.1.2",
     "eslint-plugin-react": "^7.11.1",
     "eslint-plugin-react-hooks": "^1.6.0",
-    "file-loader": "^3.0.0",
+    "file-loader": "^6.0.0",
     "html-webpack-plugin": "^3.2.0",
     "jest": "^23.6.0",
     "jest-styled-components": "^6.2.1",