Update dependency semver to ^6.2.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
semver	devDependencies	minor	^6.1.1 -> ^6.2.0

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Release Notes

npm/node-semver

v6.2.0

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• Coerce numbers to strings when passed to semver.coerce()
• Add rtl option to coerce from right to left

v6.1.3

Compare Source

• Handle X-ranges properly in includePrerelease mode

v6.1.2

Compare Source

• Do not throw when testing invalid version strings

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[coveralls]

Coverage decreased (-0.1%) to 97.782% when pulling dcfe478 on renovate/semver-6.x into 5d9cf4f on master.