add apache 2 license to gemspec
add apache 2 license to gemspec

KeenS/mirah,uujava/mirah,uujava/mirah,felixvf/mirah,felixvf/mirah,uujava/mirah,mirah/mirah,KeenS/mirah,uujava/mirah,aspleenic/mirah,aspleenic/mirah,aspleenic/mirah,mirah/mirah,KeenS/mirah,uujava/mirah,mirah/mirah,mirah/mirah,felixvf/mirah,felixvf/mirah,KeenS/mirah,aspleenic/mirah,aspleenic/mirah