Improved hostname verification

[caronc]

Description:

Related issue (if applicable): #1234

Improves the Apprise Hostname Validation

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

Testing

Anyone can help test this source code as follows:

# Create a virtual environment to work in as follows:
python3 -m venv apprise

# Change into our new directory
cd apprise

# Activate our virtual environment
source bin/activate

# Install the branch
pip install git+https://github.com/caronc/apprise.git@1234-unparsable-json

# Test out the changes with the following command:
apprise -t "Test Title" -b "Test Message" \
  " json://5t4m82hl-33333.euw.devtunnels.ms"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.36%. Comparing base (f37dfbf) to head (eed9225).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1243   +/-   ##
=======================================
  Coverage   99.36%   99.36%           
=======================================
  Files         147      147           
  Lines       20555    20555           
  Branches     3663     3663           
=======================================
  Hits        20425    20425           
  Misses        121      121           
  Partials        9        9           

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