docs/streaming_how_to.rst: Update 'async' to 'is_async' for Python >= 3.7
authorcclauss <3709715+cclauss@users.noreply.github.com>
Sat, 22 Dec 2018 13:40:37 +0000 (14:40 +0100)
committerGitHub <noreply@github.com>
Sat, 22 Dec 2018 13:40:37 +0000 (14:40 +0100)
commit86c264838f110cb536452a81e2f1ff2563b846b2
tree8b6c4ca6e3c1df45e4b18836574c092bfc37ae89
parente5d877c9e93a3fbdb005d4c5a2cfc446e4a40923
 docs/streaming_how_to.rst: Update 'async' to 'is_async' for Python >= 3.7

'__async__' is a reserved word in Python >= 3.7 so the current call is a syntax error.
docs/streaming_how_to.rst