[Snyk] Security upgrade docpad from 6.78.6 to 6.82.1

[GerHobbelt]

Snyk has created this PR to fix 16 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
	Uninitialized Memory Exposure npm:base64-url:20180512	816
	Prototype Poisoning SNYK-JS-QS-3153490	696
	Arbitrary Code Injection SNYK-JS-MORGAN-72579	661
	Prototype Pollution SNYK-JS-MINIMIST-559764	601
	Regular Expression Denial of Service (ReDoS) npm:fresh:20170908	589
	Regular Expression Denial of Service (ReDoS) npm:negotiator:20160616	589
	Prototype Override Protection Bypass npm:qs:20170213	589
	Regular Expression Denial of Service (ReDoS) SNYK-JS-COOKIEJAR-3149984	586
	Prototype Pollution npm:extend:20180424	579
	Open Redirect SNYK-JS-EXPRESS-6474509	519
	Prototype Pollution SNYK-JS-MINIMIST-2429795	506
	Regular Expression Denial of Service (ReDoS) npm:debug:20170905	506
	Information Exposure npm:superagent:20181108	479
	Regular Expression Denial of Service (ReDoS) npm:mime:20170907	399
	Regular Expression Denial of Service (ReDoS) npm:ms:20170412	399
	Denial of Service (DoS) npm:superagent:20170807	399

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• 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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🦉 Regular Expression Denial of Service (ReDoS)
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🦉 Prototype Pollution
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