[Snyk] Fix for 18 vulnerabilities

[lizhizhou]

Snyk has created this PR to fix 18 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Denial of Service (DoS) npm:ws:20171108	761
	Uninitialized Memory Exposure SNYK-JS-BL-608877	706
	Improper Input Validation SNYK-JS-SOCKETIOPARSER-3091012	704
	Prototype Pollution SNYK-JS-LODASH-6139239	696
	Denial of Service (DoS) SNYK-JS-SOCKETIOPARSER-1056752	696
	Denial of Service (DoS) SNYK-JS-WS-7266574	696
	Prototype Pollution SNYK-JS-LODASH-450202	686
	Prototype Pollution SNYK-JS-LODASH-608086	686
	Prototype Pollution SNYK-JS-LODASH-73638	686
	Code Injection SNYK-JS-LODASH-1040724	681
	Open Redirect npm:st:20171013	644
	Denial of Service (DoS) npm:ws:20160624	589
	Regular Expression Denial of Service (ReDoS) SNYK-JS-LODASH-1018905	586
	Regular Expression Denial of Service (ReDoS) SNYK-JS-WS-1296835	586
	Regular Expression Denial of Service (ReDoS) SNYK-JS-LODASH-73639	541
	Cross-site Scripting (XSS) SNYK-JS-COOKIE-8163060	529
	Insecure Randomness npm:ws:20160920	479
	Regular Expression Denial of Service (ReDoS) npm:mime:20170907	399

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