remove traling space for Travis

demos/demo_dynamic.py

@@ -266,7 +266,7 @@ if SHOW_CHACHA_EXAMPLE:
 
     template = '\n  ChaCha%d ciphertext   for "%s" is "%s"'
     print template % (rounds, plain, cipher.encode('hex'))
-    
+
     # reset to decrypt
     cha.set_iv32(iv)
     decrypted = cha.crypt(cipher)