fix import error and fix syntax error in strftime function

[h-enes-simsek]

There is a problem with the new version. You successfully solve the folder uploading problem but somehow made a syntax mistake. v1.4.3 code cannot be compiled at the moment. I fix the problem. Briefly:

• You want to use time.sleep(x) but you import time wrongly
• You mistakenly write %l instead of %I in strftime function. ( /L/ouisiana instead of /I/ndiana )

Thank you for the nice lib.

[Itz-fork]

Closing since create_folder option is only available for premium users now