Closes #460: python-gnupg version increase breaks unencrypt_file func…

[chambersh1129]

bugfix

Description

Set minimum version for python-gnupg, update docs, update utils.unencrypt_file function to use python-gnupg >= 0.5.0 decrypt_file arguments

Fixes #460

Why should this be added

Will allow tests to pass again and re-enable the encrypt/decrypt backup features for new installs.

Checklist

• Documentation has been added or amended for this feature / update

[codecov]

Codecov Report

Merging #461 (ae4974a) into master (3d94b0d) will increase coverage by 1.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #461      +/-   ##
==========================================
+ Coverage   91.12%   92.15%   +1.03%     
==========================================
  Files          19       16       -3     
  Lines         856      676     -180     
  Branches      171      141      -30     
==========================================
- Hits          780      623     -157     
+ Misses         41       30      -11     
+ Partials       35       23      -12     

Impacted Files	Coverage Δ
dbbackup/utils.py
dbbackup/settings.py
dbbackup/__init__.py

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