Switch to 1.20.1

We need to do a release to address some bugs introduced in 1.20.0,
so I think it makes sense for it to be marked as a patch release.

Signed-off-by: David Thompson <davthomp@redhat.com>

Author: datho7561

package-lock.json

@@ -1,7 +1,7 @@
 {
   "name": "yaml-language-server",
   "description": "YAML language server",
-  "version": "1.21.0",
+  "version": "1.20.1",
   "author": "Red Hat",
   "license": "MIT",
   "contributors": [