Fix call to figlet library so it works on AWS

Author: kilna

example/service.py

@@ -1,4 +1,8 @@
 #!/usr/bin/env python
-import subprocess
+
+from pyfiglet import Figlet
+
 def handler(event, context):
-  return subprocess.check_output( ['pyfiglet', '-f', event.get('font', 'small'), event.get('text', '') ] ).decode('ascii')
+  f = Figlet( font=event.get('font', 'small') )
+  return f.renderText( event.get('text', '') )
+