Update README

README.md

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-v1.3.0
+v1.3.1
 
 # `<zero-md>`
 
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 ## Version history
 
+**v1.3.1** - 2019-4-22
+* Actually build for v1.3.1 (fixes [#15](https://github.com/zerodevx/zero-md/issues/15)).
+* Automate the chore of version bumping else I keep missing things.
+
 **v1.3.0** - 2019-04-21
 * Exposes the `ZeroMd.config` global to set default values applying to **all** instances of `<zero-md>` in the document. (Ref: PR[#12](https://github.com/zerodevx/zero-md/pull/12)) - thanks [@bennypowers](https://github.com/bennypowers)!
 * Update default host CSS to help normalise behavior across browsers. Fixes [#13](https://github.com/zerodevx/zero-md/issues/13) - thanks [@bennypowers](https://github.com/bennypowers)!