Syntax error with Python 3.7

[sekiyama58]

daff causes SyntaxError on launch with Python 3.7.

$ python3 --version
Python 3.7.0
$ pip3 install daff
$ daff
Traceback (most recent call last):
  File "/usr/local/bin/daff", line 7, in <module>
    from daff import main
  File "/usr/local/bin/daff.py", line 2723
    if io.async():
              ^
SyntaxError: invalid syntax

[sekiyama58]

In Python 3.7, async is reserved as a keyword, so cannot be used as function name.
Trying to call async() causes a SyntaxError exception.

[paulfitz]

Thanks for reporting this, working on a fix in #116.

[paulfitz]

Please reopen if problem persists in version 1.3.33 - cheers!