Follow GNU-style ChangeLog

Use two spaces between date and name, and between name and email.
Prepend "* " to subject.

See also
GNU Coding Standards: Change Logs:
<http://www.gnu.org/prep/standards/html_node/Change-Logs.html>
gitlog2changelog (to show changed files):
<http://anonscm.debian.org/gitweb/?p=collab-maint/w3m.git;a=blob_plain;f=debian/gitlog2changelog;hb=refs/heads/debian>