Update CHANGELOG for 0.49 wrt final patches
Update CHANGELOG for 0.49 wrt final patches

As title.

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