Pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@babel/cli (source)	devDependencies	pin	^7.0.0 -> 7.12.1
@babel/core (source)	devDependencies	pin	^7.0.0 -> 7.12.3
@babel/plugin-proposal-object-rest-spread	devDependencies	pin	^7.0.0 -> 7.12.1
@babel/polyfill (source)	devDependencies	pin	^7.0.0 -> 7.12.1
@babel/preset-env (source)	devDependencies	pin	^7.0.0 -> 7.12.1
@babel/preset-react (source)	devDependencies	pin	^7.0.0 -> 7.12.1
babel-core (source)	devDependencies	pin	^7.0.0-bridge.0 -> 7.0.0-bridge.0
babel-jest	devDependencies	pin	^23.4.2 -> 23.6.0
css-minimizer-webpack-plugin	devDependencies	pin	^1.1.5 -> 1.1.5
html-webpack-plugin	devDependencies	pin	^4.5.0 -> 4.5.0
mini-css-extract-plugin	devDependencies	pin	^1.2.1 -> 1.2.1
webpack-cli	devDependencies	pin	4 -> 4.1.0

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

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