Bump ecdsa from 0.13.2 to 0.13.3

[dependabot]

Bumps ecdsa from 0.13.2 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.

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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[coveralls]

Coverage remained the same at 85.313% when pulling 2ed5f59 on dependabot/pip/ecdsa-0.13.3 into f343df6 on master.