fix(package): update @types/highlight.js to version 9.12.0 (#647)

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
  "dependencies": {
  "@types/fs-extra": "4.0.0",
  "@types/handlebars": "4.0.31",
- "@types/highlight.js": "9.1.8",
+ "@types/highlight.js": "9.12.0",
  "@types/lodash": "4.14.74",
  "@types/marked": "0.3.0",
  "@types/minimatch": "2.0.29",