The tests directory is moved to the beginning of the module search path.
Therefore "import xml.something" does fail in this case. Therefore avoid
using a xml module name for the tests.

Avoid including main heading and toc into the toc. Also use '-' for
unordered list in toc.

It seems the users are following the README very closely without knowing
pip semantics. Therefore mention only the best fitting installation
method.

Sphinx interprets the docstring as rst. Therefore using **kwargs expects
closing **.

Add GMP v8 to the docs

Update python-gvm to use GMPv8 as latest GMP protocol

Using base TestCase classes will allow to simplify the tests.

Implement API to receive vulnerability information.

Allow to create, clone, delete, get and modify tickets.

Closes #95

We still need support for python 3.5 therefore don't add trailing commas
to method signatures.

Replace the CREDENTIAL_TYPES list with a CredentialType enum.

Expect a CredentialType instance for the credential_type arguments. It's
easier to use Enums for specific types for method arguments.

Document the correct id argument. Was a copy&paste mistake from the
protocol docs.