only log errors on 500 responses (fixes #30)

src/lib.rs

@@ -338,11 +338,14 @@ openapi = ["gotham-restful/openapi"]
 into your libraries `Cargo.toml` and use the following for all types used with handlers:
 
 ```
+# #[cfg(feature = "openapi")]
+# mod openapi_feature_enabled {
 # use gotham_restful::OpenapiType;
 # use serde::{Deserialize, Serialize};
 #[derive(Deserialize, Serialize)]
 #[cfg_attr(feature = "openapi", derive(OpenapiType))]
 struct Foo;
+# }
 ```
 
 # Examples

src/result/mod.rs

@@ -104,8 +104,17 @@ where
 	E: Display + IntoResponseError
 {
 	into_response_helper(|| {
-		errorlog(&e);
-		e.into_response_error()
+		let msg = e.to_string();
+		let res = e.into_response_error();
+		match &res {
+			Ok(res) if res.status.is_server_error() => errorlog(msg),
+			Err(err) => {
+				errorlog(msg);
+				errorlog(&err);
+			},
+			_ => {}
+		};
+		res
 	})
 }