CHANGELOG.md: Acknowledge last-minute fix for Win terminals
* [Fix panics with "Broken pipe" when using in a shell pipeline][pr#1765]
* [Document `--no-self-update` properly][pr#1763]
* [Clear line properly in download progress][pr#1781]
+* [More download progress line clearing fixes][pr#1788]
* [Fix a bunch of clippy warnings/errors][pr#1778]
### Removed
[pr#1778]: https://github.com/rust-lang/rustup.rs/pull/1778
[pr#1780]: https://github.com/rust-lang/rustup.rs/pull/1780
[pr#1781]: https://github.com/rust-lang/rustup.rs/pull/1781
+[pr#1781]: https://github.com/rust-lang/rustup.rs/pull/1788
## [1.17.0] - 2019-03-05
