chore(deps): update dependency @types/node to v10.14.21

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@types/node	devDependencies	patch	10.14.20 -> 10.14.21

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[coveralls]

Coverage remained the same at 100.0% when pulling 95891b29108101240130e330f8b746cad4f1a987 on renovate/node-10.x into 79dc800ec9f255dda7c5ac2bb10c04bb2aafc20f on master.