Gitter Support Removed (available through Matrix)

[caronc]

Description:

Related issue (if applicable): #835

Gitter support removed as it is part of Matrix now.

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@835-gitter-support-dropped

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.01% ⚠️

Comparison is base (207db69) 99.52% compared to head (e3dfb8a) 99.52%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #924      +/-   ##
==========================================
- Coverage   99.52%   99.52%   -0.01%     
==========================================
  Files         122      121       -1     
  Lines       16290    16166     -124     
  Branches     3327     3308      -19     
==========================================
- Hits        16213    16089     -124     
  Misses         68       68              
  Partials        9        9              

Files Changed	Coverage Δ
apprise/plugins/NotifyDiscord.py	100.00% <ø> (ø)
apprise/plugins/NotifyParsePlatform.py	100.00% <ø> (ø)
apprise/plugins/NotifyReddit.py	100.00% <ø> (ø)

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