Bump asn1 from 2.2.0 to 2.3.1

Bumps [asn1](https://github.com/andrivet/python-asn1) from 2.2.0 to 2.3.1.
- [Release notes](https://github.com/andrivet/python-asn1/releases)
- [Changelog](https://github.com/andrivet/python-asn1/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/andrivet/python-asn1/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

requirements.in

@@ -1,4 +1,4 @@
-asn1==2.2.0
+asn1==2.3.1
 cryptography>=2.8.0
 cffi>=1.14.0
 future==0.18.2

requirements.txt

@@ -4,12 +4,13 @@
 #
 #    pip-compile --output-file=requirements.txt requirements.in
 #
-asn1==2.2.0               # via -r requirements.in
+asn1==2.3.1               # via -r requirements.in
 certifi==2018.11.29       # via requests
 cffi==1.14.0              # via -r requirements.in, cryptography
 chardet==3.0.4            # via requests
 cryptography==2.8         # via -r requirements.in, pyopenssl
 deprecated==1.2.10        # via -r requirements.in
+enum34==1.1.10            # via asn1
 future==0.18.2            # via -r requirements.in
 idna==2.7                 # via requests
 iso8601==0.1.12           # via -r requirements.in

setup.py

@@ -29,7 +29,7 @@
         "protobuf>=3.1.0",
         "requests>=2.11.1",
         "future>=0.11.0",
-        "asn1==2.2.0",
+        "asn1==2.3.1",
         "pyopenssl>=18.0.0",
         "iso8601==0.1.12",
     ],