Pin dependencies

[vingle-suzy]

This PR contains the following updates:

Package	Type	Update	Change
@types/chai	devDependencies	pin	^4.0.0 -> 4.0.10
@types/mocha	devDependencies	pin	^2.2.41 -> 2.2.45
chai (source)	devDependencies	pin	^4.0.1 -> 4.1.2
check-engine	devDependencies	pin	^1.7.0 -> 1.7.0
mocha (source)	devDependencies	pin	^3.4.2 -> 3.5.3
np	devDependencies	pin	^3.1.0 -> 3.1.0
tslint (source)	devDependencies	pin	^5.12.1 -> 5.12.1
typescript (source)	devDependencies	pin	^2.9.2 -> 2.9.2

📌 Important: Renovate will wait until you have merged this Pin PR before creating any upgrade PRs for the affected packages. Add the preset :preserveSemverRanges your config if you instead don't wish to pin dependencies.

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