Implement JsonSchema on Uuid

schemars/tests/expected/uuid.json

@@ -0,0 +1,6 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "Uuid",
+  "type": "string",
+  "format": "uuid"
+}

schemars/tests/uuid.rs

@@ -0,0 +1,8 @@
+mod util;
+use uuid::Uuid;
+use util::*;
+
+#[test]
+fn uuid() -> TestResult {
+    test_default_generated_schema::<Uuid>("uuid")
+}