[release] package.json: Add "template" property to go.addTags configu…

…ration

Add the missing template property for addTags.

Fixes #965

Change-Id: I930e405f0dd1fe0267c8a321549dca49258e2772
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/273187
Trust: Suzy Mueller <suzmue@golang.org>
Run-TryBot: Suzy Mueller <suzmue@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/273189
TryBot-Result: kokoro <noreply+kokoro@google.com>

package.json

@@ -1697,6 +1697,11 @@
  ],
  "default": "snakecase",
  "description": "Transformation rule used by Go: Add Tags command to add tags"
+ },
+ "template": {
+ "type": "string",
+ "default": "",
+ "description": "Custom format used by Go: Add Tags command for the tag value to be applied"
  }
  },
  "additionalProperties": false,