Merge pull request #22 from teloxide/impl_payload_must_use

add #[must_use] attr to payloads implemented by macro

src/local_macros.rs

@@ -160,6 +160,7 @@ macro_rules! impl_payload {
         }
     ) => {
         #[serde_with_macros::skip_serializing_none]
+        #[must_use = "Requests do nothing unless sent"]
         $(
             #[ $($method_meta)* ]
         )*