fix non conforming search link resolution and update to 0.3.5

[philvarner]

Related Issue(s): #177

Description:

• fix handling of search link in non-conforming API

PR Checklist:

• Code is formatted
• Tests pass
• Changes are added to the CHANGELOG

[codecov-commenter]

Codecov Report

Merging #179 (1495cb8) into release/0.3.5 (64ec0c1) will not change coverage.
The diff coverage is 100.00%.

@@              Coverage Diff               @@
##           release/0.3.5     #179   +/-   ##
==============================================
  Coverage          81.00%   81.00%           
==============================================
  Files                  9        9           
  Lines                558      558           
==============================================
  Hits                 452      452           
  Misses               106      106           

Impacted Files	Coverage Δ
pystac_client/client.py	78.68% <100.00%> (ø)
pystac_client/version.py	100.00% <100.00%> (ø)

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