fix(deps): update dependency core-js to v3

package.json

@@ -56,7 +56,7 @@
     "@ngx-loading-bar/http-client": "4.2.0",
     "@ngx-loading-bar/router": "4.2.0",
     "@nrwl/angular": "8.4.3",
-    "core-js": "2.6.9",
+    "core-js": "3.1.4",
     "date-fns": "1.30.1",
     "firebase": "6.3.3",
     "hammerjs": "2.0.8",

yarn.lock

@@ -3475,11 +3475,6 @@ [email protected]:
   resolved "https://registry.yarnpkg.com/core-js-pure/-/core-js-pure-3.1.4.tgz#5fa17dc77002a169a3566cc48dc774d2e13e3769"
   integrity sha512-uJ4Z7iPNwiu1foygbcZYJsJs1jiXrTTCvxfLDXNhI/I+NHbSIEyr548y4fcsCEyWY0XgfAG/qqaunJ1SThHenA==
 
-[email protected]:
-  version "2.6.9"
-  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.9.tgz#6b4b214620c834152e179323727fc19741b084f2"
-  integrity sha512-HOpZf6eXmnl7la+cUdMnLvUxKNqLUzJvgIziQ0DiF3JwSImNphIqdGqzj6hIKyX04MmV0poclQ7+wjWvxQyR2A==
-
 [email protected], core-js@^3.1.3:
   version "3.1.4"
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.1.4.tgz#3a2837fc48e582e1ae25907afcd6cf03b0cc7a07"