Landscape-api-py3

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* minor fixes

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* replaced **pycurl** --> **requests**

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* on **Ubuntu 16.04** (Xenial Xerus) use **sudo apt-get install -y libgnutls-dev**
* on **Ubuntu 20.04** (Focal Fossa) use **sudo apt-get install -y libgnutls28-dev libcurl4-openssl-dev libssl-dev**
* on **Windows 10** simply use **pipx install landscape_api_py3**

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* first release on PyPI