Move codegen types to syn-codegen crate
diff --git a/codegen/src/json.rs b/codegen/src/json.rs
index 63764b6..8e45308 100644
--- a/codegen/src/json.rs
+++ b/codegen/src/json.rs
@@ -1,4 +1,4 @@
-use crate::types::Definitions;
+use syn_codegen::Definitions;
 
 use std::fs;
 use std::path::Path;