Bump minimatch from 3.0.4 to 3.0.8

Bumps [minimatch](https://github.com/isaacs/minimatch) from 3.0.4 to 3.0.8.
- [Release notes](https://github.com/isaacs/minimatch/releases)
- [Commits](https://github.com/isaacs/minimatch/compare/v3.0.4...v3.0.8)

---
updated-dependencies:
- dependency-name: minimatch
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -43,7 +43,7 @@
     "eslint-plugin-jest": "^21.1.0",
     "extract-text-webpack-plugin": "^3.0.0",
     "jest": "^22.0.4",
-    "node-sass": "4.9.4",
+    "node-sass": "4.13.1",
     "npm-run-all": "^4.1.1",
     "postcss-loader": "^2.0.6",
     "pre-commit": "^1.2.2",
@@ -54,7 +54,7 @@
     "smart-banner-webpack-plugin": "^3.0.1",
     "style-loader": "^0.19.1",
     "webpack": "^3.6.0",
-    "webpack-dev-server": "^3.1.11"
+    "webpack-dev-server": "^2.8.2"
   },
   "scripts": {
     "prebuild": "rimraf static/js/webslide*",