issue-62: Adds PARROT_ALLOWED_HOSTS env var

[lowitea]

closes #62

[codecov]

Codecov Report

Merging #63 (f59d4be) into develop (1f47caf) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop      #63   +/-   ##
========================================
  Coverage    98.31%   98.31%           
========================================
  Files            5        5           
  Lines          119      119           
  Branches         4        4           
========================================
  Hits           117      117           
  Misses           2        2           

Impacted Files	Coverage Δ
parrot/settings.py	100.00% <100.00%> (ø)

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
0.0% Duplication