Bump python-gnupg from 0.3.7 to 0.4.4

Bumps [python-gnupg](https://bitbucket.org/vinay.sajip/python-gnupg) from 0.3.7 to 0.4.4.
- [Commits](https://bitbucket.org/vinay.sajip/python-gnupg/branches/compare/0.4.4..0.3.7)

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

Author: dependabot[bot]

setup.py

@@ -124,7 +124,7 @@
         "SQLAlchemy==1.2.19",
         "Werkzeug==0.12.2",
         "itsdangerous==0.24",
-        "python-gnupg==0.3.7",
+        "python-gnupg==0.4.4",
         "pytz==2016.10",
         "WTForms==2.0.2",
         "Flask-WTF==0.12",