Update README.md
Update the link to the conan page, as https://conan.io/source/jsoncpp/1.8.0/theirix/ci returns a 404.
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# JsonCpp
-[](http://www.conan.io/source/jsoncpp/1.8.0/theirix/ci)
+[](https://bintray.com/theirix/conan-repo/jsoncpp%3Atheirix)
[JSON][json-org] is a lightweight data-interchange format. It can represent
numbers, strings, ordered sequences of values, and collections of name/value