hints for using with typescript

[stefanpl]

Hey,

thanks a lot for providing this plugin. I had a bit of a hard time using it with Typescript though, until I found this post on SO.

Although it's not strictly related to your plugin, I think it would be nice to have a short passage about it in the readme. I think there might be more people like me who want to start using Gatsby with Typescript, and don't have prior experience with having to setup the Typescript-SVG bit themselves.

Please see if you agree, and feel free to modify as you see fit.

Peace

[jacobmischka]

Thanks for the PR!

[stefanpl]

Thanks for merging it! And once again, thanks for providing the plugin :)