Sleep when curses is unavailable

When the curses gem is not installed and the session is running inside
tmux the user will see a flash of an opened and closed tmux pane but
will not have a chance to read the error message.

1 files changed, 1 insertions, 0 deletions

diff --git a/fzf b/fzf
index abfd97e9..3b049b92 100755
--- a/fzf
+++ b/fzf
@@ -40,6 +40,7 @@ begin
   require 'curses'
 rescue LoadError
   $stderr.puts 'curses gem is not installed. Try `gem install curses`.'
+  sleep 1
   exit 1
 end
 require 'thread'