"minor xticklabels" key is not in PGFPLOTS

[esarradj]

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This code:

https://github.com/nschloe/tikzplotlib/blob/aee7a4ff145159476a7d07248f4b93c2372e73e7/tikzplotlib/axes.py#L207-L209

may produce the axes key 'minor xticklabels' which is not know in PGFPLOTS as of version 1.16

The same holds for y

[nschloe]

For reference: https://tex.stackexchange.com/a/513659/13262