Pin dependencies

This MR contains the following updates:

Package	Type	Update	Change
bootstrap (source)	dependencies	pin	^4.4.1 -> 4.4.1
bootswatch (source)	dependencies	pin	^4.4.1 -> 4.4.1
node-sass	devDependencies	pin	^4.13.0 -> 4.13.0
prettier (source)	devDependencies	pin	^1.19.1 -> 1.19.1
react (source)	dependencies	pin	^16.12.0 -> 16.12.0
react-dom (source)	dependencies	pin	^16.12.0 -> 16.12.0
tslint (source)	devDependencies	pin	^5.20.1 -> 5.20.1
tslint-react	devDependencies	pin	^4.1.0 -> 4.1.0
typescript (source)	devDependencies	pin	^3.7.2 -> 3.7.2

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

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