Pin dependencies

This MR contains the following updates:

Package	Type	Update	Change
babel-core (source)	devDependencies	pin	^6.26.0 -> 6.26.3
babel-eslint	devDependencies	pin	^7.1.1 -> 7.2.3
babel-loader	devDependencies	pin	^7.1.2 -> 7.1.5
babel-plugin-transform-decorators-legacy	devDependencies	pin	^1.3.4 -> 1.3.5
babel-polyfill (source)	devDependencies	pin	^6.26.0 -> 6.26.0
babel-preset-react (source)	devDependencies	pin	^6.22.0 -> 6.24.1
babel-preset-stage-0 (source)	devDependencies	pin	^6.22.0 -> 6.24.1
chalk	devDependencies	pin	^2.1.0 -> 2.4.2
copy-webpack-plugin	devDependencies	pin	^4.2.0 -> 4.6.0
cross-env	devDependencies	pin	^5.0.5 -> 5.2.1
css-loader	devDependencies	pin	^0.28.7 -> 0.28.11
eslint-config-prettier	devDependencies	pin	^6.10.0 -> 6.10.0
eslint-config-standard	devDependencies	pin	^10.2.1 -> 10.2.1
eslint-config-standard-react	devDependencies	pin	^5.0.0 -> 5.0.0
eslint-loader	devDependencies	pin	^1.9.0 -> 1.9.0
eslint-plugin-promise	devDependencies	pin	^3.4.0 -> 3.8.0
eslint-plugin-standard	devDependencies	pin	^3.0.1 -> 3.1.0
exports-loader	devDependencies	pin	^0.6.3 -> 0.6.4
extract-text-webpack-plugin	devDependencies	pin	^3.0.0 -> 3.0.2
file-loader	devDependencies	pin	^0.11.2 -> 0.11.2
html-loader	devDependencies	pin	^0.5.1 -> 0.5.5
html-webpack-plugin	devDependencies	pin	^2.30.1 -> 2.30.1
husky	devDependencies	pin	^4.2.3 -> 4.2.3
lint-staged	devDependencies	pin	^10.0.8 -> 10.0.8
ngrok	devDependencies	pin	^2.2.22 -> 2.3.0
node-sass	devDependencies	pin	^4.13.1 -> 4.13.1
nodemon (source)	devDependencies	pin	^1.12.0 -> 1.19.4
opn	devDependencies	pin	^5.1.0 -> 5.5.0
postcss-cssnext (source)	devDependencies	pin	^3.0.2 -> 3.1.0
postcss-focus	devDependencies	pin	^2.0.0 -> 2.0.0
postcss-loader	devDependencies	pin	^2.0.6 -> 2.1.6
postcss-reporter	devDependencies	pin	^5.0.0 -> 5.0.0
postcss-smart-import	devDependencies	pin	^0.7.5 -> 0.7.6
prettier (source)	devDependencies	pin	^2.0.1 -> 2.0.1
react-router-loader	devDependencies	pin	^0.5.4 -> 0.5.4
rimraf	devDependencies	pin	^2.6.1 -> 2.7.1
sass-loader	devDependencies	pin	^6.0.6 -> 6.0.7
standard (source)	devDependencies	pin	^10.0.3 -> 10.0.3
style-loader	devDependencies	pin	^0.18.2 -> 0.18.2
webpack	devDependencies	pin	^3.5.5 -> 3.12.0
webpack-dev-middleware	devDependencies	pin	^1.12.0 -> 1.12.2
webpack-hot-middleware	devDependencies	pin	^2.18.2 -> 2.25.0

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