Update arraymath.py
Update arraymath.py

fix flake8 error

seibert/numba,seibert/numba,numba/numba,cpcloud/numba,stonebig/numba,stonebig/numba,numba/numba,cpcloud/numba,IntelLabs/numba,cpcloud/numba,cpcloud/numba,stuartarchibald/numba,IntelLabs/numba,stonebig/numba,stonebig/numba,numba/numba,cpcloud/numba,IntelLabs/numba,numba/numba,seibert/numba,stuartarchibald/numba,seibert/numba,IntelLabs/numba,seibert/numba,numba/numba,stuartarchibald/numba,stonebig/numba,IntelLabs/numba,stuartarchibald/numba,stuartarchibald/numba