autopep8 pending when ignore E303

[willdonggg]

when use autopep8 format the code below with '--ignore E303', the process will be pending and cpu usage will increase to 100%

# define move function
def move_right():
    print('move left')
    return
# define star function

def star():
    print('step1: choose one paper')
    print('step2: xxxx')
    print('step3: xxxx')
    print('step4: xxxx')
    print('step5: xxxx')
    print('step6: xxxx')
    return



# move to right place
move_right()
move_right()

# finish star
star()
star()

autopep8 version: 1.3.5
python version：3.6.3
os: CentOS 6.8 or macOS Sierra 10.12.6

[hhatto]

fixed in latest master branch.

Thanks