[Snyk] Fix for 31 vulnerabilities

[crew-security]

Snyk has created this PR to fix 31 vulnerabilities in the yarn dependencies of this project.

Snyk changed the following file(s):

• package.json

Note for zero-installs users

If you are using the Yarn feature zero-installs that was introduced in Yarn V2, note that this PR does not update the .yarn/cache/ directory meaning this code cannot be pulled and immediately developed on as one would expect for a zero-install project - you will need to run yarn to update the contents of the ./yarn/cache directory.
If you are not using zero-install you can ignore this as your flow should likely be unchanged.

⚠️ Warning

Failed to update the yarn.lock, please update manually before merging.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Uninitialized Memory Exposure npm:base64-url:20180512	816
	Uninitialized Memory Exposure npm:http-proxy-agent:20180406	796
	Uninitialized Memory Exposure npm:https-proxy-agent:20180402	796
	Authentication Bypass SNYK-JS-HAWK-6969142	786
	Uninitialized Memory Exposure npm:base64url:20180511	741
	Prototype Pollution SNYK-JS-LODASH-567746	731
	Sandbox Bypass npm:constantinople:20180421	714
	Prototype Pollution SNYK-JS-LODASH-6139239	696
	Prototype Poisoning SNYK-JS-QS-3153490	696
	Regular Expression Denial of Service (ReDoS) SNYK-JS-SEMVER-3247795	696
	Regular Expression Denial of Service (ReDoS) npm:sshpk:20180409	696
	Prototype Pollution SNYK-JS-LODASH-450202	686
	Prototype Pollution SNYK-JS-LODASH-608086	686
	Prototype Pollution SNYK-JS-LODASH-73638	686
	Prototype Pollution SNYK-JS-Y18N-1021887	686
	Code Injection SNYK-JS-LODASH-1040724	681
	Uninitialized Memory Exposure npm:stringstream:20180511	646
	Prototype Pollution SNYK-JS-JSONSCHEMA-1920922	644
	Prototype Pollution npm:hoek:20180212	636
	Prototype Pollution npm:lodash:20180130	636
	Prototype Pollution SNYK-JS-AJV-584908	619
	Directory Traversal SNYK-JS-MOMENT-2440688	589
	Regular Expression Denial of Service (ReDoS) SNYK-JS-LODASH-1018905	586
	Regular Expression Denial of Service (ReDoS) SNYK-JS-HAWK-2808852	584
	Prototype Pollution npm:extend:20180424	579
	Regular Expression Denial of Service (ReDoS) SNYK-JS-LODASH-73639	541
	Regular Expression Denial of Service (ReDoS) npm:clean-css:20180306	506
	Regular Expression Denial of Service (ReDoS) npm:debug:20170905	506
	Insecure Randomness npm:cryptiles:20180710	479
	Regular Expression Denial of Service (ReDoS) npm:moment:20170905	399
	Regular Expression Denial of Service (ReDoS) npm:ms:20170412	399

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Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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