Update relnotes links

Author: alexcrichton

Diff for: _posts/2017-04-27-Rust-1.17.md

@@ -18,7 +18,7 @@ appropriate page on our website, and check out the [detailed release notes for
 1.17.0][notes] on GitHub.
 
 [install]: https://www.rust-lang.org/install.html
-[notes]: https://github.com/rust-lang/rust/blob/rust-1.17-relnotes/RELEASES.md#version-1170-2017-04-27
+[notes]: https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-1170-2017-04-27
 
 ### What's in 1.17.0 stable
 

Diff for: _posts/2017-07-20-Rust-1.19.md

@@ -18,7 +18,7 @@ appropriate page on our website, and check out the [detailed release notes for
 1.19.0][notes] on GitHub.
 
 [install]: https://www.rust-lang.org/install.html
-[notes]:  https://github.com/rust-lang/rust/blob/rust-1.19.0-relnotes/RELEASES.md#version-1190-2017-07-20
+[notes]:  https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-1190-2017-07-20
 
 ### What's in 1.19.0 stable