fix: update to core.js 3

fixes #997

Author: RomanHotsiy

package.json

@@ -126,7 +126,7 @@
     "yaml-js": "^0.2.3"
   },
   "peerDependencies": {
-    "core-js": "^2.6.5",
+    "core-js": "^3.1.4",
     "mobx": "^4.2.0 || ^5.0.0",
     "react": "^16.8.4",
     "react-dom": "^16.8.4",

src/services/SearchWorker.worker.ts

@@ -2,7 +2,7 @@ import * as lunr from 'lunr';
 
 try {
   // tslint:disable-next-line
-  require('core-js/es6/promise'); // bundle into worker
+  require('core-js/es/promise'); // bundle into worker
 } catch (_) {
   // nope
 }