Update security/py-ecdsa to 0.13
--------------------------------

pkgsrc changes:

- Adjust EGG_NAME

Upstream changes:

* Release 0.13 (07 Feb 2015)

Fix the argument order for Curve constructor (put openssl_name= at the end,
with a default value) to unbreak compatibility with external callers who used
the 0.11 convention.

* Release 0.12 (06 Feb 2015)

Switch to Versioneer for version-string management (fixing the broken
`ecdsa.__version__` attribute). Add Curve.openssl_name property. Mention
secp256k1 in README, test against OpenSSL. Produce "wheel" distributions. Add
py3.4 and pypy3 compatibility testing. Other minor fixes.

(gls)