CHANGELOG: Update hopefully ready for 1.19.0
- [Add support for `rustup target add all`][pr#1868]
- [Add `rustup show home`][pr#1933]
+- [Add NetBSD target to CI][pr#1978]
### Thanks
- Bryan Dady
- Fisher Darling
- Bjorn3
+- Iku Iwasa
[pr#1873]: https://github.com/rust-lang/rustup.rs/pulls/1873
[pr#1885]: https://github.com/rust-lang/rustup.rs/pulls/1885
[pr#1961]: https://github.com/rust-lang/rustup.rs/pulls/1961
[pr#1868]: https://github.com/rust-lang/rustup.rs/pulls/1868
[pr#1933]: https://github.com/rust-lang/rustup.rs/pulls/1933
+[pr#1978]: https://github.com/rust-lang/rustup.rs/pulls/1978
## [1.18.3] - 2019-05-22
