程序执行前先git pull后再执行

[PSoul]

fix #799

[coveralls]

Pull Request Test Coverage Report for Build 430

• 0 of 0 (NaN%) changed or added relevant lines in 0 files are covered.
• 13 unchanged lines in 6 files lost coverage.
• Overall coverage remained the same at 41.626%

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Files with Coverage Reduction	New Missed Lines	%
cobra/pickup.py	2	33.06%
cobra/cve.py	2	81.5%
cobra/init.py	2	29.11%
cobra/export.py	2	60.0%
cobra/log.py	2	44.93%
cobra/utils.py	3	35.77%

Totals
Change from base Build 426:	0.0%
Covered Lines:	1608
Relevant Lines:	3863

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💛 - Coveralls

[40huo]

每次都去GitHub拉一下感觉会很慢，有时候国内的网还是不稳