Update README.md

Remove Travis, which is not free anymore.

Author: mclarkson

README.md

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 # JSONPath.sh
 
-[![travis](https://secure.travis-ci.org/mclarkson/JSONPath.sh.png?branch=master)](https://travis-ci.org/mclarkson/JSONPath.sh)
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 This is a JSONPath implementation written in Bash.
 
 See how JSONPath.sh compares to other implementations: