fix: add missing @babel/runtime package to address silent error getting thrown on Travis

Author: sghoweri

packages/uikit-workshop/dist/styleguide/js/patternlab-viewer.js

@@ -56,6 +56,7 @@
     "workbox-build": "^3.4.1"
   },
   "dependencies": {
+    "@babel/runtime": "^7.5.4",
     "@babel/plugin-proposal-class-properties": "^7.5.0",
     "@babel/plugin-proposal-decorators": "^7.4.4",
     "@babel/plugin-syntax-dynamic-import": "^7.2.0",