Update test add_extensions as extentsions are sorted in 1.7.

libgit2/libgit2@e25f9a9

Author: weihanglo

tests/add_extensions.rs

@@ -12,10 +12,10 @@ fn test_add_extensions() -> Result<(), Error> {
     let extensions = unsafe { get_extensions() }?;
 
     assert_eq!(extensions.len(), 3);
-    assert_eq!(extensions.get(0), Some("noop"));
+    assert_eq!(extensions.get(0), Some("custom"));
     // The objectformat extension was added in 1.6
-    assert_eq!(extensions.get(1), Some("objectformat"));
-    assert_eq!(extensions.get(2), Some("custom"));
+    assert_eq!(extensions.get(1), Some("noop"));
+    assert_eq!(extensions.get(2), Some("objectformat"));
 
     Ok(())
 }