chore(deps): update dependency css-loader to v7

Author: renovate[bot]

package.json

@@ -38,7 +38,7 @@
     "babel-core": "6.26.0",
     "babel-preset-env": "1.6.1",
     "babel-preset-es2015-rollup": "1.2.0",
-    "css-loader": "0.23.1",
+    "css-loader": "7.1.2",
     "eslint": "2.13.1",
     "rollup": "0.25.8",
     "rollup-plugin-babel": "2.7.1",