Catch and warn on github timeouts

[jerry-skydio]

Its pretty common for us to hit the 10s github
timeout for very large graphql mutations. In pretty
much all of these cases though, the actual changes
in the request did go through, and a subsequent
revup upload will show everything up to date.

To reflect this and make it nicer for users, catch any
github exception that contains 'timeout' and turn it
into a warning instead. This ensures that we show the topic
list. If the user wishes, they can rerun the command to
verify the changes were actually successful.

Topic: githubtimeout
Reviewers: aaron, brian-k

[jerry-skydio]

Reviews in this chain:
└#114 Catch and warn on github timeouts

[jerry-skydio]

#	head	base	diff	date	summary
0	1a9feb29	92bd9efb	diff	Apr 13 19:17 PM	3 files changed, 26 insertions(+), 17 deletions(-)
1	7d701a07	7ca78675	diff	Apr 18 19:20 PM	1 file changed, 7 insertions(+), 3 deletions(-)
2	9f73e92c	7ca78675	diff	Apr 18 19:23 PM	1 file changed, 1 insertion(+), 1 deletion(-)

[aaron-skydio]

Very nice