README.md: fix link to `test_index_racy__diff` The syntax for links is `[description](link)z, not the other way round. Fix this.
diff --git a/README.md b/README.md
index d30b165..c5adafa 100644
--- a/README.md
+++ b/README.md
@@ -217,7 +217,7 @@ run the index tests:
$ ./libgit2_clar -sindex
To run a single test named `index::racy::diff`, which corresponds to the test
-function (`test_index_racy__diff`)[https://github.com/libgit2/libgit2/blob/master/tests/index/racy.c#L23]:
+function [`test_index_racy__diff`](https://github.com/libgit2/libgit2/blob/master/tests/index/racy.c#L23):
$ ./libgit2_clar -sindex::racy::diff