Fix-up README to clarify what Numba is no
Fix-up README to clarify what Numba is no

stuartarchibald/numba,gmarkall/numba,pitrou/numba,stefanseefeld/numba,gmarkall/numba,pombredanne/numba,pitrou/numba,pitrou/numba,pombredanne/numba,GaZ3ll3/numba,jriehl/numba,ssarangi/numba,gmarkall/numba,numba/numba,gmarkall/numba,jriehl/numba,stefanseefeld/numba,stuartarchibald/numba,numba/numba,sklam/numba,gdementen/numba,stefanseefeld/numba,shiquanwang/numba,sklam/numba,numba/numba,seibert/numba,pitrou/numba,gdementen/numba,gdementen/numba,stonebig/numba,IntelLabs/numba,sklam/numba,jriehl/numba,GaZ3ll3/numba,jriehl/numba,GaZ3ll3/numba,IntelLabs/numba,IntelLabs/numba,sklam/numba,pombredanne/numba,gmarkall/numba,cpcloud/numba,gdementen/numba,GaZ3ll3/numba,stuartarchibald/numba,stefanseefeld/numba,seibert/numba,cpcloud/numba,pitrou/numba,stonebig/numba,seibert/numba,stonebig/numba,sklam/numba,cpcloud/numba,ssarangi/numba,cpcloud/numba,IntelLabs/numba,cpcloud/numba,jriehl/numba,ssarangi/numba,pombredanne/numba,pombredanne/numba,seibert/numba,shiquanwang/numba,stuartarchibald/numba,shiquanwang/numba,stonebig/numba,ssarangi/numba,stefanseefeld/numba,gdementen/numba,numba/numba,stuartarchibald/numba,numba/numba,ssarangi/numba,IntelLabs/numba,stonebig/numba,GaZ3ll3/numba,seibert/numba