RFR: Update README.md

[Joe Darcy]

PS No additional typos were found in the README.

-Joe

On 7/30/2019 10:48 PM, Joe Darcy via github.com wrote:
> Fix typo in description of hgbridge.
>
> ----------------
>
> Commits:
>   - ebd737b8:	Update README.md
> 			Fix typo in description of hgbridge.
>
> Pull request:
> http://git.openjdk.java.net/skara/pull/33
>
> Webrev:
> https://openjdk.github.io/cr/skara/33/webrev.00
>
> Patch:
> http://git.openjdk.java.net/skara/pull/33.diff
>
> Fetch command:
> git fetch https://github.com/openjdk/skara.git pull/33/head:pull/33