lua-cjson-219

This is a pinned rock to 2.1.0.9-1 of openresty/lua-cjson,
This rock exists because lua-cjson has not had releases published for some time.
The Lua CJSON module provides JSON support for Lua. It features:
- Fast, standards compliant encoding/parsing routines
- Full support for JSON with UTF-8, including decoding surrogate pairs
- Optional run-time support for common exceptions to the JSON specification
(infinity, NaN,..)
- No dependencies on other libraries