Update time requirement from 0.1 to 0.2 (#541)

Updates the requirements on [time](https://github.com/time-rs/time) to permit the latest version.
- [Release notes](https://github.com/time-rs/time/releases)
- [Changelog](https://github.com/time-rs/time/blob/v0.2.26/CHANGELOG.md)
- [Commits](time-rs/time@0.1.35...v0.2.26)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Dominic <git@msrd0.de>

examples/sessions/custom_data_type/Cargo.toml

@@ -13,5 +13,5 @@ gotham_derive = { path = "../../../gotham_derive" }
 mime = "0.3"
 serde = "1"
 serde_derive = "1"
-time = "0.1"
+time = "0.2"
 cookie = "0.15"

examples/sessions/custom_data_type/src/main.rs

@@ -11,6 +11,7 @@ use gotham::pipeline::single::single_pipeline;
 use gotham::router::builder::*;
 use gotham::router::Router;
 use gotham::state::{FromState, State};
+use time::{Format, OffsetDateTime};
 
 // A custom type for storing data associated with the user's session.
 #[derive(Clone, Deserialize, Serialize, StateData)]
@@ -40,9 +41,12 @@ fn get_handler(mut state: State) -> (State, String) {
         let visit_data: &mut Option<VisitData> =
             SessionData::<Option<VisitData>>::borrow_mut_from(&mut state);
         let old_count = maybe_visit_data.map(|v| v.count).unwrap_or(0);
+        let last_visit = OffsetDateTime::try_now_local()
+            .unwrap_or_else(|_| OffsetDateTime::now_utc())
+            .format(Format::Rfc3339);
         *visit_data = Some(VisitData {
             count: old_count + 1,
-            last_visit: format!("{}", time::now().rfc3339()),
+            last_visit,
         });
     }