chg: dev: changed default config file name towards ``~/.gitchangelog.rc`` instead of ``~/.git-changelog.rc``.
chg: dev: changed default config file name towards ``~/.gitchangelog.rc`` instead of ``~/.git-changelog.rc``.

JBKahn/gitchangelog,developerinlondon/gitchangelog,JBKahn/gitchangelog,developerinlondon/gitchangelog