fix LLVM version
MODIFY
Dockerfile
Dockerfile
#
# This Dockerfile for AFLplusplus uses Ubuntu 20.04 focal and
-# installs LLVM 11 from llvm.org for afl-clang-lto support :-)
+# installs LLVM 12 from llvm.org for afl-clang-lto support :-)
#
FROM ubuntu:20.04 AS aflplusplus

fix LLVM version