JSON-schema 1.3

• option to add default values during validation
• add thread-safe API
• build static library by default (jsoncpp only builds static library by default)

JSON-Schema 1.2

Add a NEWS.md file, build a shared library by default (needs jsoncpp shared library), and fix the pkgconfig file to list all dependencies.

JSON-Schema 1.1

The include path for the header was changed to have a json/ prefix, just like jsoncpp has.

First public release

This is the first public release of the library.