Cannot create cache directory 에러 수정 방법
/* 오류내용 */ Cannot create cache directory /home/username/.composer/cache/repo/https---packagist.org/, or directory is not writable. Proceeding without cache /* 수정방법 */ $ sudo chown -R $USER $HOME/.composer
/* 오류내용 */ Cannot create cache directory /home/username/.composer/cache/repo/https---packagist.org/, or directory is not writable. Proceeding without cache /* 수정방법 */ $ sudo chown -R $USER $HOME/.composer