tokio: update dates in CHANGELOG.md to 2021
-# 1.1.0 (January 22, 2020)
+# 1.1.0 (January 22, 2021)
### Added
[#3457]: https://github.com/tokio-rs/tokio/pull/3457
[#3458]: https://github.com/tokio-rs/tokio/pull/3458
-# 1.0.2 (January 14, 2020)
+# 1.0.2 (January 14, 2021)
### Fixed
- io: soundness in `read_to_end` ([#3428]).
