Fix whitespace token issue with newer flair versions #28
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With flair>=0.5, whitespace tokens are ignored when constructing sentences (flair code).
To make round-trips from standoff -> token -> standoff possible, those tokens need to be retained. As a fix, we previously added an upper bound on the flair version (#20). However, this prevents us from upgrading to newer flair versions.
In this PR, we update sentence construction such that whitespace-only tokens are replaced with a special token.
Furthermore, the upper bound on the flair version can now be removed.