Prevent year 2038 problem in ChatMember

This patch changes the Type of `{Restricted,Kicked}::until_date` fields:
`i32` => `i64`.

This is done to fix so called "year 2038 problem"
(See <https://en.wikipedia.org/wiki/Year_2038_problem>).

CHANGELOG.md

@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - `GetChatAdministrators` output type `ChatMember` => `Vec<ChatMember>` ([#73][pr73])
 - `reqwest` dependency bringing `native-tls` in even when `rustls` was selected ([#71][pr71])
+- Type of `{Restricted,Kicked}::until_date` fields: `i32` => `i64` ([#74][pr74])
 
 [pr71]: https://github.com/teloxide/teloxide-core/pull/71
 [pr73]: https://github.com/teloxide/teloxide-core/pull/73

src/types/chat_member.rs

@@ -104,7 +104,7 @@ pub struct Administrator {
 pub struct Restricted {
     /// Date when restrictions will be lifted for
     /// this user, unix time.
-    pub until_date: i32,
+    pub until_date: i64,
 
     /// `true`, if the user can send text messages,
     /// contacts, locations and venues.
@@ -129,7 +129,7 @@ pub struct Restricted {
 pub struct Kicked {
     /// Date when restrictions will be lifted for
     /// this user, unix time.
-    pub until_date: i32,
+    pub until_date: i64,
 }
 
 /// This allows calling [`ChatMemberKind`]'s methods directly on [`ChatMember`]
@@ -260,7 +260,7 @@ impl ChatMemberKind {
     }
 
     /// Getter for [`Restricted::until_date`] and [`Kicked::until_date`] fields.
-    pub fn until_date(&self) -> Option<i32> {
+    pub fn until_date(&self) -> Option<i64> {
         match &self {
             Self::Creator(_) | Self::Administrator(_) | Self::Member | Self::Left => None,
             Self::Restricted(Restricted { until_date, .. })