Bump ecdsa from 0.13 to 0.13.3

[dependabot]

Bumps ecdsa from 0.13 to 0.13.3.

Release notes

Sourced from ecdsa's releases.

ecdsa 0.13.3

Fix CVE-2019-14853 - possible DoS caused by malformed signature decoding
Fix CVE-2019-14859 - signature malleability caused by insufficient checks of DER encoding

Also harden key decoding from string and DER encodings.

ecdsa 0.13.2

Restore compatibility of setup.py with Python 2.6 and 2.7.

ecdsa 0.13.1

Fix the PyPI wheel - the old version included .pyc files.

Changelog

Sourced from ecdsa's changelog.

• Release 0.13.3 (07 Oct 2019)

Fix CVE-2019-14853 - possible DoS caused by malformed signature decoding and
signature malleability.

Also harden key decoding from string and DER encodings.

• Release 0.13.2 (17 Apr 2019)

Restore compatibility of setup.py with Python 2.6 and 2.7.

• Release 0.13.1 (17 Apr 2019)

Fix the PyPI wheel - the old version included .pyc files.

• 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.

• Release 0.11 (10 Mar 2014)

Add signature-encoding functions "sigencode_{strings,string,der}_canonize"
which canonicalize the S value (using the smaller of the two possible
values). Add "validate_point=" argument to VerifyingKey.from_string()
constructor (defaults to True) which can be used to disable time-consuming
point validation when importing a pre-validated verifying key. Drop python2.5
support (untested but not explicitly broken yet), update trove classifiers.

• Release 0.10 (23 Oct 2013)

Make the secp256k1 available in init.py too (thanks to Scott Bannert).

• Release 0.9 (01 Oct 2013)

Add secp256k1 curve (thanks to Benjamin Dauvergne). Add deterministic (no
entropy needed) signatures (thanks to slush). Added py3.2/py3.3 compatibility
(thanks to Elizabeth Myers).

• Release 0.8 (04 Oct 2011)

Small API addition: accept a hashfunc= argument in the constructors for

... (truncated)

Commits

• 7add221 update NEWS file for 0.13.3
• 5c4c74a Merge pull request #124 from tomato42/backport-sig-decode
• 1eb2c04 update README with error handling of from_string() and from_der()
• b95be03 execute also new tests in Travis
• 99c907d harden also key decoding
• 3427fa2 ensure that the encoding is actually the minimal one for length and integer
• 563d2ee make variable names in remove_integer more aproppriate
• 14abfe0 explicitly specify the distro to get py26 and py33
• 9080d1d fix length decoding
• 897178c give the same handling to string encoded signatures as to DER
• Additional commits viewable in compare view

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