3.6 tests failing due to remove_mention_text #747
Merged
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Fixes #743
The 3.6 re.escape() doesn't work the same as in 3.7. and 3.8, which was causing remove_mention_text to fail.
Copied the 3.8 re.escape() function into botbuilder.
Also, the remove_mention_text assertions weren't correct. They would never raise a failure.