Update dependency core-js to v3

package.json

@@ -28,7 +28,7 @@
     "angular-oauth2-oidc": "12.1.0",
     "angular2-uuid": "1.1.1",
     "components-font-awesome": "4.7.0",
-    "core-js": "2.6.12",
+    "core-js": "3.18.1",
     "jsonapi-datastore": "0.4.0-beta",
     "ng2-ace-editor": "0.3.9",
     "ng2-file-upload": "1.4.0",

yarn.lock

@@ -2037,10 +2037,10 @@ [email protected]:
     serialize-javascript "^2.1.2"
     webpack-log "^2.0.0"
 
-core-js@2.6.12:
-  version "2.6.12"
-  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.12.tgz#d9333dfa7b065e347cc5682219d6f690859cc2ec"
-  integrity sha512-Kb2wC0fvsWfQrgk8HU5lW6U/Lcs8+9aaYcy4ZFc6DDlo4nZ7n70dEgE5rtR0oG6ufKDUnrwfWL1mXR5ljDatrQ==
+core-js@3.18.1:
+  version "3.18.1"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.18.1.tgz#289d4be2ce0085d40fc1244c0b1a54c00454622f"
+  integrity sha512-vJlUi/7YdlCZeL6fXvWNaLUPh/id12WXj3MbkMw5uOyF0PfWPBNOCNbs53YqgrvtujLNlt9JQpruyIKkUZ+PKA==
 
 core-js@^2.4.0:
   version "2.6.11"