add mention of github.com/qri-io/jsonschema

Author: b5

implementations.md

@@ -167,6 +167,7 @@ Data parsing
     -   [Bric-à-brac](https://github.com/glimpseio/BricBrac) (MIT) - generates idiomatic swift structs and parser/serializer from JSON schemas
 -   Golang
     -  [gojsonschema](https://github.com/andy-zhangtao/gojsonschema)(Apache 2.0) - golang package for generating golang struct *supports Draft 4*. [Demo](http://json.golang.chinazt.cc)
+    -  [jsonschema](https://github.com/qri-io/jsonschema)(MIT) - idiomatic go implementation with custom validator support, coding to and from json, rich error returns *supports Draft 7*
 
 UI generation
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