python3 only

[komuw]

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Now,

What(What have you changed?)

• support only python3

Why(Why did you change it?)

• the future FTW

[codecov]

Codecov Report

Merging #72 into acmev2 will increase coverage by 0.97%.
The diff coverage is 95.83%.

@@            Coverage Diff             @@
##           acmev2      #72      +/-   ##
==========================================
+ Coverage   90.93%   91.91%   +0.97%     
==========================================
  Files           5        5              
  Lines         331      334       +3     
==========================================
+ Hits          301      307       +6     
+ Misses         30       27       -3

Impacted Files	Coverage Δ
sewer/dns_providers/common.py	47.36% <ø> (+1.91%)	⬆️
sewer/dns_providers/auroradns.py	93.18% <100%> (ø)	⬆️
sewer/dns_providers/cloudflare.py	95.65% <100%> (ø)	⬆️
sewer/ACMEclient.py	94.49% <94.11%> (+0.62%)	⬆️