Modeified README.rst (support MIPSEL)
Modeified README.rst (support MIPSEL)

zcsteele/turbo,luastoned/turbo,YuanPeir-Chen/turbo-support-mipsel,luastoned/turbo,mniestroj/turbo,kernelsauce/turbo,YuanPeir-Chen/turbo-support-mipsel,zcsteele/turbo