add tests for 3.0.0b4

[samuelcolvin]

No description provided.

[codecov]

Codecov Report

Merging #173 into master will decrease coverage by 0.36%.
The diff coverage is 93.18%.

@@            Coverage Diff             @@
##           master     #173      +/-   ##
==========================================
- Coverage    94.9%   94.54%   -0.37%     
==========================================
  Files          12       12              
  Lines         766      715      -51     
  Branches       94       90       -4     
==========================================
- Hits          727      676      -51     
+ Misses         25       24       -1     
- Partials       14       15       +1

Impacted Files	Coverage Δ
aiohttp_devtools/cli.py	100% <ø> (ø)	⬆️
aiohttp_devtools/runserver/watch.py	95.89% <100%> (+1.44%)	⬆️
aiohttp_devtools/version.py	100% <100%> (ø)	⬆️
aiohttp_devtools/runserver/main.py	100% <100%> (ø)	⬆️
aiohttp_devtools/runserver/config.py	84.95% <70.58%> (-3.42%)	⬇️
aiohttp_devtools/runserver/serve.py	93.92% <97.95%> (-0.38%)	⬇️

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