Update my name and email in runtime files (#12763)

diff --git a/runtime/ftplugin/rust.vim b/runtime/ftplugin/rust.vim
index 7efca59..ececcce 100644
--- a/runtime/ftplugin/rust.vim
+++ b/runtime/ftplugin/rust.vim
@@ -1,7 +1,7 @@
 " Language:     Rust
 " Description:  Vim ftplugin for Rust
 " Maintainer:   Chris Morgan <me@chrismorgan.info>
-" Maintainer:   Kevin Ballard <kevin@sb.org>
+" Maintainer:   Lily Ballard <lily@ballards.net>
 " Last Change:  June 08, 2016
 " For bugs, patches and license go to https://github.com/rust-lang/rust.vim