Allow for buffer address in captial letters 
Allow for buffer address in captial letters 

After a fresh install of anaconda on windows, `_re_buffer_address_match` failed. Probably because qimage.bits() returns the address in capital letters, like <read-write buffer ptr 0x000000000BA30040, size 1309456 at 0x000000000BB8B228>
pbvarga1/qimage2ndarray,hmeine/qimage2ndarray,pbvarga1/qimage2ndarray,pbvarga1/qimage2ndarray,hmeine/qimage2ndarray