tag.version is the tag not the repo (#72)

Author: chmac

lib/git.js

@@ -36,7 +36,7 @@ const services = ['upload-pack', 'receive-pack'];
   * @property {HttpDuplex} tag - an http duplex object (see below) with these extra properties:
   * @property {String} tag.repo - the string that defines the repo
   * @property {String} tag.commit - the string that defines the commit sha
-  * @property {String} tag.version - the string that defines the repo
+  * @property {String} tag.version - the string that defines the tag being pushed
   * @example
     repos.on('tag', function (tag) { ... }