[ruby/reline] Add space

https://github.com/ruby/reline/commit/4b7fa6b213

lib/reline/windows.rb

@@ -170,7 +170,7 @@ class Reline::Windows
 
   @@output = STDOUT
 
-  def self.msys_tty?(io=@@hConsoleInputHandle)
+  def self.msys_tty?(io = @@hConsoleInputHandle)
     # check if fd is a pipe
     if @@GetFileType.call(io) != FILE_TYPE_PIPE
       return false