Can you release a first D8 version of your module?
I tested the dev version and it works very well. I also reviewed your code and beside your (quick and dirty) inline CSS formatting for the filter field I couldn't see anything that should be improved. So I will give you a RTBC and would be happy, if you could release a 1.0 version or at least an alpha or beta version (to make a composer Installation of the module easier).
Thanks in advance.
Closed: outdated
1.0
Code
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