specify licenses in package.json (#197)

Author: zeke

package.json

@@ -7,6 +7,7 @@
     "name": "GitHub",
     "url": "https://github.com/github/docs"
   },
+  "license": "(MIT AND CC-BY-4.0)",
   "dependencies": {
     "@babel/core": "^7.8.3",
     "@babel/plugin-transform-runtime": "^7.11.0",