Update protoc-artfacts

protoc-artifacts/README.md

@@ -70,9 +70,9 @@ support. DO NOT close the staging repository until you have done the
 deployment for all platforms. Currently the following platforms are supported:
 - Linux (x86_32 and x86_64)
 - Windows (x86_32 and x86_64) with
- - Cygwin64 with MinGW compilers (x86_64)
- - MSYS with MinGW32 (x86_32)
- - Cross compile in Linux with MinGW-w64 (x86_32, x86_64)
+  - Cygwin64 with MinGW compilers (x86_64)
+  - MSYS with MinGW32 (x86_32)
+  - Cross compile in Linux with MinGW-w64 (x86_32, x86_64)
 - MacOSX (x86_32 and x86_64)
 
 As for MSYS2/MinGW64 for Windows: protoc will build, but it insists on
@@ -174,8 +174,9 @@ stored:
 ### Tested build environments
 We have successfully built artifacts on the following environments:
 - Linux x86_32 and x86_64:
- - Centos 6.6 (within Docker 1.6.1)
- - Ubuntu 14.04.2 64-bit
+  - Centos 6.6 (within Docker 1.6.1)
+  - Ubuntu 14.04.2 64-bit
+- Linux aarch_64: Cross compiled with `g++-aarch64-linux-gnu` on Ubuntu 14.04.2 64-bit
 - Windows x86_32: MSYS with ``mingw32-gcc-g++ 4.8.1-4`` on Windows 7 64-bit
 - Windows x86_32: Cross compile with ``i686-w64-mingw32-g++ 4.8.2`` on Ubuntu 14.04.2 64-bit
 - Windows x86_64: Cygwin64 with ``mingw64-x86_64-gcc-g++ 4.8.3-1`` on Windows 7 64-bit