freemobile:// msg moved from GET parameters and into payload

[caronc]

Description:

Related issue (if applicable): #1090

Bugfix to move msg into payload (and out of kwarg GET parameters)

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@1090-mobile-free-bugfix

# Test out the changes with the following command:
apprise -t "Test Title" -b "Test Message" \
  freemobile://user@password

[caronc]

@rabonarca would you mind giving this branch a try to see if it helps your situation?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.27%. Comparing base (cced5ed) to head (36393b1).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1106 +/- ## ========================================== - Coverage 99.27% 99.27% -0.01% ========================================== Files 139 139 Lines 18029 18028 -1 Branches 3680 3680 ========================================== - Hits 17899 17898 -1 Misses 121 121 Partials 9 9 ```

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[rabonarca]

@rabonarca would you mind giving this branch a try to see if it helps your situation?

With the changes I proposed it still didn't work. As I had more time today for testing I managed to make it work by adding 'Content-Type': 'application/json' to the headers and keeping the msg in the payload.

[caronc]

Fixed in #1109