Clear the current line before starting Pry.

This should fix #566.

Signed-off-by: Yorick Peterse <yorickpeterse@gmail.com>

lib/pry/pry_class.rb

@@ -132,6 +132,14 @@ class Pry
       head = target
     end
 
+    # Clear the line before starting Pry. This fixes the issue discussed here:
+    # https://github.com/pry/pry/issues/566
+    if defined?(Win32::Console)
+      puts "\e[0F"
+    else
+      puts "\e[0A\e[0G"
+    end
+
     # Enter the matrix
     pry_instance.repl(head)
   end