Release 1.7.0

[skupriienko]

Actions:

• Update CHANGELOG.md
• Update _version.py
• Build the package from the source
• Fix minor issues and typos
  • Update pip on CI
  • Exclude tests in the sdist
  • Don't use *.pyi in MANIFEST.in and pyproject.toml
  • Update recipe: no need to skip heavy tests
  • Address Code quality suggestions

Notes:

• A simple test:

python3 -m venv test_mailjet170rc1

source test_mailjet170rc1/bin/activate

pip3 install --upgrade pip
pip3 install mailjet-rest==1.7.0rc1

python3 -c "from mailjet_rest.client import Client"
python3 -c "import mailjet_rest; from importlib.metadata import version; print(f'Successfully installed v{version(\"mailjet_rest\")}')"

# output: 
Successfully installed v1.7.0rc1