chore(deps): update dependency @types/node to v10.14.20

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@types/node	devDependencies	patch	10.14.19 -> 10.14.20

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[coveralls]

Coverage remained the same at 100.0% when pulling e75a8c9760597fc755b6eed0e3c160467414abd2 on renovate/node-10.x into 69bf0b29f137778df19bb9d34b2456b9840965fd on master.