[ssig33.com - コンテンツに履歴表示するもの作った]の位置を修正
使い方を追記
Escape {% git_log %}
git_log.rb uses `commit_permalink` in config

At first, I wrote like this:

_config.yml
  repository: https://github.com/vzvu3k6k/vzvu3k6k.github.com/

git_log.rb
  <a href="#{repository}commit/#{id}">...</a>

But it won't work with a repository in Bitbucket (it uses
`commits`).

Commit permalink templates on hosting services:
  GitHub: https://github.com/foo/bar/commit/{id}
  Gitweb: https://gitweb.example.org/bar.git/commit/{id}
  Bitbucket: https://bitbucket.org/foo/bar/commits/{id}
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