Bump node-sass from 4.14.1 to 7.0.0 in /themes/minimo (#9)

Bumps [node-sass](https://github.com/sass/node-sass) from 4.14.1 to 7.0.0.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/node-sass/compare/v4.14.1...v7.0.0)

---
updated-dependencies:
- dependency-name: node-sass
  dependency-type: direct:development
...

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themes/minimo/package.json

@@ -26,7 +26,7 @@
     "cssnano": "^4.1.10",
     "eslint": "^5.16.0",
     "mini-css-extract-plugin": "^0.7.0",
-    "node-sass": "^4.14.1",
+    "node-sass": "^7.0.0",
     "postcss-loader": "^3.0.0",
     "sass-loader": "^7.1.0",
     "webpack": "^4.32.2",