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

package.json

@@ -35,7 +35,7 @@
     "@angular/platform-browser": "7.2.15",
     "@angular/platform-browser-dynamic": "7.2.15",
     "@angular/router": "7.2.15",
-    "core-js": "2.6.5",
+    "core-js": "3.1.4",
     "rxjs": "6.5.2",
     "zone.js": "0.9.1"
   },

yarn.lock

@@ -2643,10 +2643,10 @@ [email protected]:
     p-limit "^1.0.0"
     serialize-javascript "^1.4.0"
 
-core-js@2.6.5:
-  version "2.6.5"
-  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.5.tgz#44bc8d249e7fb2ff5d00e0341a7ffb94fbf67895"
-  integrity sha512-klh/kDpwX8hryYL14M9w/xei6vrv6sE8gTHDG7/T/+SEovB/G4ejwcfE/CBzO6Edsu+OETZMZ3wcX/EjUkrl5A==
+core-js@3.1.4:
+  version "3.1.4"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.1.4.tgz#3a2837fc48e582e1ae25907afcd6cf03b0cc7a07"
+  integrity sha512-YNZN8lt82XIMLnLirj9MhKDFZHalwzzrL9YLt6eb0T5D0EDl4IQ90IGkua8mHbnxNrkj1d8hbdizMc0Qmg1WnQ==
 
 core-js@^2.2.0, core-js@^2.4.0:
   version "2.5.7"