changed "how can i contribute."
changed "how can i contribute."

i stopped using redmine some reasons.
please fork my repository and send a pull request to me.

garvins/php-git,garvins/php-git,libgit2/php-git,garvins/php-git,garvins/php-git,libgit2/php-git,MagicalTux/php-git,MagicalTux/php-git,MagicalTux/php-git,libgit2/php-git