Merge branch '3-0-0-release' into 'master'

Release 3.0.0

See merge request gitlab-org/gitlab-vscode-extension!70

CHANGELOG.md

 # CHANGELOG
 
-## v3.0.0 - TBD
+## v3.0.0 - 2020-06-25
 
 - Support multi root workspaces.
 - Enable custom queries in GitLab panel.

package.json

@@ -2,7 +2,7 @@
   "name": "gitlab-workflow",
   "displayName": "GitLab Workflow",
   "description": "GitLab VSCode integration",
-  "version": "2.2.2",
+  "version": "3.0.0",
   "publisher": "GitLab",
   "license": "MIT",
   "repository": {