Update API link in README

[cez81]

Link to API documentation is broken in the README (https://godoc.org/code.gitea.io/sdk/gitea). Add link to https://try.gitea.io/api/swagger instead

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@c8b4c7a). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #5241   +/-   ##
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  Coverage          ?   37.48%           
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  Files             ?      310           
  Lines             ?    45923           
  Branches          ?        0           
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  Hits              ?    17213           
  Misses            ?    26236           
  Partials          ?     2474

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[techknowlogick]

make LG-TM work