Bump version to 0.21.0 (#635)

Signed-off-by: Jinbo Wang <[email protected]>

Author: testforstephen

package-lock.json

@@ -2,7 +2,7 @@
   "name": "vscode-java-debug",
   "displayName": "Debugger for Java",
   "description": "A lightweight Java debugger for Visual Studio Code",
-  "version": "0.20.0",
+  "version": "0.21.0",
   "publisher": "vscjava",
   "preview": true,
   "aiKey": "67d4461e-ccba-418e-8082-1bd0acfe8516",
@@ -46,7 +46,7 @@
       }
     ],
     "javaExtensions": [
-      "./server/com.microsoft.java.debug.plugin-0.20.0.jar"
+      "./server/com.microsoft.java.debug.plugin-0.21.0.jar"
     ],
     "commands": [
       {