Bump prismjs from 1.15.0 to 1.23.0 (#80)

Bumps [prismjs](https://github.com/PrismJS/prism) from 1.15.0 to 1.23.0.
- [Release notes](https://github.com/PrismJS/prism/releases)
- [Changelog](https://github.com/PrismJS/prism/blob/master/CHANGELOG.md)
- [Commits](PrismJS/prism@v1.15.0...v1.23.0)

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package.json

@@ -60,7 +60,7 @@
     "fitvids": "^2.0.0",
     "fontfaceobserver": "^2.0.13",
     "ghosthunter": "git://github.com/jamalneufeld/ghostHunter.git",
-    "prismjs": "^1.15.0",
+    "prismjs": "^1.23.0",
     "store": "^2.0.12",
     "toastr": "^2.1.4"
   }