fix(pythonFStr): do not expand if whitespace between braces #15
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Currently the f-string expands if there is whitespace in between the braces, which is likely not when the user intends to use f-strings. The current pattern breaks docstrings containing braces, e.g. a docstring describing an object or json.
It's a slight compromise, as whitespace in braces would not result in an invalid f-string, but this seems to me the more sensible handling.
This would also partially resolve #9.