Update README
Update README

Add some info about how to enable gzip compression on Apache servers

pomf/pomf,pjuklas/Pomf,alucard0134/Pomf,pjuklas/Pomf,GodOfConquest/Pomf,alucard0134/Pomf,ewhal/gpomf,pjuklas/Pomf,pomf/pomf,pomf/moe,nokonoko/Pomf,pomf/moe,pomf/pomf-php,nokonoko/Pomf,bohrmeista/1338,pomf/moe,bohrmeista/1338,alucard0134/Pomf,GodOfConquest/Pomf,nokonoko/Pomf,kimoi/Pomf,kimoi/Pomf,kimoi/Pomf,GodOfConquest/Pomf