Add miri to the windows proxies

Author: oli-obk

src/rustup-win-installer/src/lib.rs

@@ -27,6 +27,8 @@ static TOOLS: &'static [&'static str] = &[
     "rustfmt",
     "cargo-fmt",
     "cargo-clippy",
+    "miri",
+    "cargo-miri",
 ];
 
 #[no_mangle]