Change release channel default to stable.

Author: ignatz

rustc_tools_util/src/lib.rs

@@ -161,13 +161,13 @@ pub fn get_channel() -> String {
     if let Some(rustc_output) = get_output("rustc", &["-V"]) {
         if rustc_output.contains("beta") {
             return String::from("beta");
-        } else if rustc_output.contains("stable") {
-            return String::from("stable");
+        } else if rustc_output.contains("nightly") {
+            return String::from("nightly");
         }
     }
 
-    // default to nightly
-    String::from("nightly")
+    // default to stable
+    String::from("stable")
 }
 
 #[cfg(test)]