Add npm run tsc to end of prepublishOnly

Author: jordangarcia

packages/optimizely-sdk/package.json

@@ -15,7 +15,7 @@
     "lint": "eslint src/**",
     "cover": "npm run tsc && istanbul cover _mocha ./lib/*.tests.js ./lib/**/*.tests.js ./lib/**/**/*tests.js",
     "coveralls": "npm run cover -- --report lcovonly && cat ./coverage/lcov.info | coveralls",
-    "prepublishOnly": "npm run build-browser-umd && npm test && npm run test-xbrowser && npm run test-umdbrowser"
+    "prepublishOnly": "npm run build-browser-umd && npm test && npm run test-xbrowser && npm run test-umdbrowser && npm run tsc"
   },
   "repository": {
     "type": "git",