Auto merge of rust-lang#12694 - hi-rustin:rustin-patch-bors, r=jonas-schievink

Remove useless bors.toml

It seems we do not use bors-ng anymore. So maybe this is useless.

Author: bors

bors.toml

@@ -196,6 +196,6 @@ fn normalize_newlines(s: &str) -> String {
 pub fn project_root() -> PathBuf {
     let dir = env!("CARGO_MANIFEST_DIR");
     let res = PathBuf::from(dir).parent().unwrap().parent().unwrap().to_owned();
-    assert!(res.join("bors.toml").exists());
+    assert!(res.join("triagebot.toml").exists());
     res
 }