README.md: remove dead link

Change-Id: I8298edcf5fa8ad52594cdabe1728960a0804cb21
GitHub-Last-Rev: 2814fb469699f9166f22bbc60ffb063f0e67bf54
GitHub-Pull-Request: golang/gofrontend#11
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/592995
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
diff --git a/README.md b/README.md
index c2eae02..c723481 100644
--- a/README.md
+++ b/README.md
@@ -20,5 +20,3 @@
 If your organization is the copyright holder, the organization will need to agree to the [Google Software Grant and Corporate Contributor License Agreement](http://code.google.com/legal/corporate-cla-v1.0.html).
 
 If the copyright holder for your code has already completed the agreement in connection with another Google open source project, it does not need to be completed again.
-
-The authors of these files may be found in the [AUTHORS](./AUTHORS) and [CONTRIBUTORS](./CONTRIBUTORS) files.