Update location of the libfuzzer repository

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
GH: #4648
diff --git a/fuzz/README.md b/fuzz/README.md
index 3800ef1..8536566 100644
--- a/fuzz/README.md
+++ b/fuzz/README.md
@@ -27,7 +27,7 @@
     $ sudo apt-get install subversion
     $ mkdir svn-work
     $ cd svn-work
-    $ svn co http://llvm.org/svn/llvm-project/llvm/trunk/lib/Fuzzer
+    $ svn co https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer Fuzzer
     $ cd Fuzzer
     $ clang++ -c -g -O2 -std=c++11 *.cpp
     $ ar r libFuzzer.a *.o