message: Add Windows version requirements to readme
  Fixes
diff: @@ -47,8 +47,10 @@ Prebuilt binaries for macOS and Windows can also be downloaded from the
  For everyone else, the detailed instructions to install Alacritty can be found
  [here](INSTALL.md).
  -Since Alacritty uses OpenGL to render the terminal content on all platforms, it
  -is currently not possible to run it without support for at least OpenGL 3.3.
  +### Requirements
  +
  +- OpenGL 3.3 or higher
  +- [Windows] ConPTY support (Windows 10 version 1809 or higher)
  ## Configuration
  