Adds ability to pass an open file descriptor to the Reader class. #53
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This small PR is complementary to maxmind/MaxMind-DB-Reader-python#33, allowing one to pass an open file descriptor to the
Reader()class upon instantiation (instead of just a string path to the database). The comments in the PR just referenced include a longer reasoning/use-case for this functionality.Since none of the current unit tests instantiate a
Reader()object with an explicitmode, I've just added a small stub test class namedTestFDReader(not a subclass ofBaseTesteReader), which currently does nothing. It's a placeholder and reminder that it could be used in the future.