correctly find domains that start with "as", #24

[grizz]

Fixes #24

[codecov-io]

Codecov Report

Merging #25 (0d0224a) into master (74e1ffa) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #25   +/-   ##
=======================================
  Coverage   93.97%   93.97%           
=======================================
  Files           7        7           
  Lines         382      382           
=======================================
  Hits          359      359           
  Misses         23       23           

Impacted Files	Coverage Δ
rdap/client.py	95.23% <100.00%> (ø)

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