[flang] Adjust README.md for upstreaming to LLVM.

Original-commit: flang-compiler/f18@24d23963b879d6586a7e19b89a905341627fe5b1

diff --git a/flang/README.md b/flang/README.md
index 8da65c3..a64bab0 100644 (file)
--- a/flang/README.md
+++ b/flang/README.md
@@ -53,23 +53,15 @@ git clone https://github.com/flang-compiler/f18.git
 
 ### Supported C++ compilers
 
-F18 is written in C++17 and it has LLVM libraries dependency.
+F18 is written in C++17.
 
 The code has been compiled and tested with
-GCC versions from 7.2.0 to 9.3.0.
+GCC versions 7.2.0, 7.3.0, 8.1.0, and 8.2.0.
 
 The code has been compiled and tested with
-clang version 7.0, 8.0, 9.0 and 10.0
+clang version 7.0 and 8.0
 using either GNU's libstdc++ or LLVM's libc++.
 
-The code has been compiled on
-AArch64, x86_64 and ppc64le servers
-with CentOS7, Ubuntu18.04, Rhel, MacOs, Mojave, XCode and
-Apple LLVM version 10.0.1.
-
-The code does not compile with Windows and
-a compiler that does not have support for C++17.
-
 ### LLVM dependency
 
 F18 uses components from LLVM.