Make RequestError::RetryAfter::0 u32, instead of i32

(you can't really wait a negative amount of time, can you?)

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## unreleased
 
+### Changed
+
+- `RequestError::RetryAfter` now has a `u32` field instead of `i32`
+
 ### Added
 
 - `UserId::{url, is_anonymous, is_channel, is_telegram}` convenience functions ([#197][pr197]) 

src/errors.rs

@@ -31,7 +31,7 @@ pub enum RequestError {
     /// In case of exceeding flood control, the number of seconds left to wait
     /// before the request can be repeated.
     #[error("Retry after {0} seconds")]
-    RetryAfter(i32),
+    RetryAfter(u32),
 
     /// Network error while sending a request to Telegram.
     #[error("A network error: {0}")]

src/types/response_parameters.rs

@@ -16,7 +16,7 @@ pub enum ResponseParameters {
 
     /// In case of exceeding flood control, the number of seconds left to wait
     /// before the request can be repeated.
-    RetryAfter(i32),
+    RetryAfter(u32),
 }
 
 #[cfg(test)]