Update dependency depcheck to v0.6.8

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This PR contains the following updates:

Package	Type	Update	Change
depcheck	dependencies	patch	0.6.7 -> 0.6.8

By merging this PR, the issue #5 will be automatically resolved and closed:

Severity	CVSS Score	CVE
Medium	5.3	CVE-2020-7608

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Release Notes

depcheck/depcheck

v0.6.8

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Full Changelog

Closed issues:

• Outdated dependencies #​215
• Question: Create new npm module for plugin? #​202
• False Alert: Firefox Addons "chrome" and "sdk" #​169
• False positive when requiring files from modules directly: #​147

Merged pull requests:

• chore: fix lint errors in test/cli #​225 (jwhitmarsh)
• Bump dependencies, drop support for node < 4 #​216 (sudo-suhas)
• Include the names of each special in the README #​206 (rouanw)
• A new detector to discover express view engine #​204 (aleung)
• Fix doc error: usused.missing is not an array #​203 (aleung)
• allow babel webpack configs #​199 (deecewan)
• add: support for require.resolve in JS #​196 (pwang2)

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