Expect 204 or 200 on synchronise device state

[richtier]

Fixes this issue

[codecov-io]

Codecov Report

Merging #6 into master will increase coverage by 1.38%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   92.12%   93.51%   +1.38%     
==========================================
  Files          11       11              
  Lines         216      216              
==========================================
+ Hits          199      202       +3     
+ Misses         17       14       -3

Impacted Files	Coverage Δ
avs_client/refreshtoken/handlers.py	100% <100%> (+6.38%)	⬆️
avs_client/avs_client/connection.py	95.74% <100%> (ø)	⬆️

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