Resolve "Automated build"

Closes #37 (closed) Packaging, uploading the package and creating a gitlab release is now triggered by adding a new tag (not a release!). The release notes of the new tag MUST be empty.
Packaging and uploading should work. For now it points to the testpypi instance. After testing it from creating a test-tag, we can point the upload URL to the production instance of PyPI.

plotid/__init__.py

@@ -10,5 +10,5 @@ research data, the plot is based on. Additionally, the script that created the
 plot will also be copied to the directory.
 """
 
-__version__ = "0.2.2"
+__version__ = "0.2.2-b3"
 __author__ = "Institut Fluidsystemtechnik within nfdi4ing at TU Darmstadt"