message: Making supported operating systems more clear
diff: @@ -47,8 +47,9 @@ processing the entire blockchain.
  Compatibility
  ==============
  -Bitcoin Core is extensively tested on multiple operating systems using
  -the Linux kernel, macOS 10.10+, and Windows 7 and newer (Windows XP is not supported).
  +Bitcoin Core is supported and extensively tested on operating systems using
  +the Linux kernel, macOS 10.10+, and Windows 7 and newer. It is not recommended
  +to use Bitcoin Core on unsupported systems.
  Bitcoin Core should also work on most other Unix-like systems but is not
  frequently tested on them.
  