Process validation attributes in newtype structs

schemars/tests/expected/validate_newtype.json

@@ -0,0 +1,8 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "NewType",
+  "type": "integer",
+  "format": "uint8",
+  "maximum": 10.0,
+  "minimum": 0.0
+}

schemars/tests/validate.rs

@@ -46,3 +46,11 @@ pub struct Inner {
 fn validate() -> TestResult {
     test_default_generated_schema::<Struct>("validate")
 }
+
+#[derive(Debug, JsonSchema)]
+pub struct NewType(#[validate(range(max = 10))] u8);
+
+#[test]
+fn validate_newtype() -> TestResult {
+    test_default_generated_schema::<NewType>("validate_newtype")
+}