Commits on Jul 15, 2019

1. fix: fix PostCSS warning on build command …

   The warning is produced on `cssnano` call. See below:
   
   > Without `from` option PostCSS could generate wrong source map and will not find Browserslist config. Set it to CSS file path or to `undefined` to prevent this warning.
   
   Reproduction:
   
   ```shell
   mkdir work
   cd work
   npx docusaurus-init
   cd website
   yarn install
   yarn run build
   ```
   
   Environments:
   
   - Node: 12.6.0
   - Yarn: 1.17.3

   

   ybiquitous committed Jul 15, 2019
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