Pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
babel-core (source)	devDependencies	pin	^6.26.3 -> 6.26.3
babel-loader	devDependencies	pin	^7.1.4 -> 7.1.4
babel-preset-env (source)	devDependencies	pin	^1.7.0 -> 1.7.0
babel-preset-react (source)	devDependencies	pin	^6.24.1 -> 6.24.1
babel-preset-stage-0 (source)	devDependencies	pin	^6.24.1 -> 6.24.1
babel-preset-stage-2 (source)	devDependencies	pin	^6.24.1 -> 6.24.1
css-loader	devDependencies	pin	^0.28.11 -> 0.28.11
html-loader	devDependencies	pin	^0.5.5 -> 0.5.5
html-webpack-plugin	devDependencies	pin	^3.2.0 -> 3.2.0
nodemon (source)	devDependencies	pin	^1.17.2 -> 1.17.5
postcss-loader	devDependencies	pin	^2.1.5 -> 2.1.5
prop-types (source)	devDependencies	pin	^15.6.1 -> 15.6.1
purgecss (source)	devDependencies	pin	^1.2.0 -> 1.3.0
purgecss-webpack-plugin	devDependencies	pin	^1.4.0 -> 1.5.0
react (source)	devDependencies	pin	^16.8.6 -> 16.9.0
react-dom (source)	devDependencies	pin	^16.8.5 -> 16.9.0
style-loader	devDependencies	pin	^0.21.0 -> 0.21.0
webpack	devDependencies	pin	^4.12.0 -> 4.12.0
webpack-bundle-analyzer	devDependencies	pin	^3.2.0 -> 3.4.1
webpack-cli	devDependencies	pin	^3.0.8 -> 3.0.8
webpack-dev-server	devDependencies	pin	^3.1.4 -> 3.1.4

📌 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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