fix the decode error bug if the job params has no-ascii word

[CheungChan]

File "/Users/chenzhang/PycharmProjects/threatbook_spider/visual_spider_web/views/slave_views.py", line 74, in make_cron_tasks cron.run('update') File "/Users/chenzhang/envs/threatbook_spider/lib/python3.6/site-packages/plan/core.py", line 278, in run self.update_crontab(run_type) File "/Users/chenzhang/envs/threatbook_spider/lib/python3.6/site-packages/plan/core.py", line 221, in update_crontab current_crontab = self.read_crontab() File "/Users/chenzhang/envs/threatbook_spider/lib/python3.6/site-packages/plan/core.py", line 202, in read_crontab r = communicate_process(command, universal_newlines=True) File "/Users/chenzhang/envs/threatbook_spider/lib/python3.6/site-packages/plan/utils.py", line 22, in communicate_process output, error = p.communicate(stdin) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 843, in communicate stdout, stderr = self._communicate(input, endtime, timeout) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 1554, in _communicate self.stdout.errors) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 740, in _translate_newlines data = data.decode(encoding, errors) UnicodeDecodeError: 'ascii' codec can't decode byte 0xe6 in position 60898: ordinal not in range(128)