check towncrier message format in lint ci #74

Job	Run time
1/4	1m 58s
2/4	2m 0s
3/4	1m 58s
4/4	1m 57s
py-3-latest	1m 56s
flaky	1m 56s
_remote_background_indep_poll	1m 56s
_remote_background_indep_tcp	1m 55s
macos 1/5	2m 0s
macos 2/5	2m 0s
codecov	1s
	19m 37s

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