Consider using fswatch for dep-notify

[mattmoor]

http://emcrisostomo.github.io/fswatch/

[mattmoor]

Thanks to @jbeda for the pointer :D

[jonjohnsonjr]

Maybe worth poking around fsnotify/fsnotify#11

[mattmoor]

@rhuss was saying in knative slack that fswatch works well on macOS

[rhuss]

We used fsnotify first for our hot-reload needs in https://github.com/knative/client/blob/db569fae177eb41d688399c33f2d9de64875568f/hack/build.sh#L200-L223 but it turned out to be totally untreliably on macOS (fake detects as well as non-detects). Since we switched to fswatch everything is working as expected.

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[mattmoor]

watch is deprecated