update LIBGIT2_VERSION.
update LIBGIT2_VERSION.

php-git is still under developement. please wait implementing.

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