Add author name and date to git changelog.

scripts/release.sh

@@ -168,7 +168,8 @@ _git-changelog-body() {
    <td><a class="checksum"
           href="https://github.com/oilshell/oil/commit/%H">%h</a>
    </td>
    <td class="date">%cd</td>
    <td class="date">%ad</td>
    <td>%x00%an%x01</td>
    <td class="subject">%x00%s%x01</td>
  </tr>'
  git log \