Ecdsa deprecation warning

[nmoreaud]

python-jose/jose/utils.py

Line 13 in 58e543e

from ecdsa.ecdsa import int_to_string as _long_to_bytes

Deprecation warning : ecdsa.py:276: DeprecationWarning: Function is unused in library code. If you use this code, change to util.string_to_number.