Add default quality level to Usage()
Add default quality level to Usage()
guanzidashu/guetzli_ios_metal,google/guetzli,google/guetzli,guanzidashu/guetzli_ios_metal,guanzidashu/guetzli_ios_metal,ianhuang-777/guetzli,ianhuang-777/guetzli,ianhuang-777/guetzli,google/guetzli,google/guetzli,ianhuang-777/guetzli,szabadka/guetzli,szabadka/guetzli,guanzidashu/guetzli_ios_metal,dloeng/guetzli,dloeng/guetzli,szabadka/guetzli,dloeng/guetzli