Update README.rst

[ahopkins]

Change .org to .com for transition in Travis.

[codecov]

Codecov Report

Merging #1973 (b7c814c) into master (63567c2) will increase coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1973      +/-   ##
==========================================
+ Coverage   92.33%   92.52%   +0.18%     
==========================================
  Files          29       29              
  Lines        3263     3263              
  Branches      574      574              
==========================================
+ Hits         3013     3019       +6     
+ Misses        170      166       -4     
+ Partials       80       78       -2     

Impacted Files	Coverage Δ
sanic/server.py	82.17% <0.00%> (+1.12%)	⬆️

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