Update diff.rst

bvasiles · web-flow · commit 371c97cadba1 · 2017-07-18T12:58:56.000-04:00
`old_lineno` appeared twice. I think it should be `new_lineno` instead.
diff --git a/docs/diff.rst b/docs/diff.rst
@@ -111,5 +111,5 @@ The DiffLine type
 .. autoattribute :: pygit2.DiffLine.origin
 .. autoattribute :: pygit2.DiffLine.content
 .. autoattribute :: pygit2.DiffLine.old_lineno
-.. autoattribute :: pygit2.DiffLine.old_lineno
+.. autoattribute :: pygit2.DiffLine.new_lineno
 .. autoattribute :: pygit2.DiffLine.num_lines
