[docs] add note about babel cache to upgrade guide (#778)

for details see #759
facebook · Jun 15, 2018 · 850e300 · 850e300
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commit 850e300
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diff --git a/docs/getting-started-installation.md b/docs/getting-started-installation.md
@@ -95,3 +95,5 @@ or
 ```
 npm update docusaurus
 ```
+
+> If you are finding that you are getting errors after your upgrade, try to either clear your Babel cache (usually it's in a [temporary directory](https://babeljs.io/docs/en/babel-register/#environment-variables) or run the Docusaurus server (e.g., `yarn start`) with the `BABEL_DISABLE_CACHE=1` environment configuration.