Update README.md

Add link to latest release and hence to downloadable version of the repository.

Author: jleffler

README.md

@@ -95,14 +95,9 @@ _(The Perl scripts should normally be renamed after downloading.)_
 
 ## Download
 
-You should be able to get a release of this repository from the releases area
-of this GitHub repository.
-
-<!--
-You can download a gzipped tar file containing the raw grammars, the
-HTML versions of those grammars, and the conversion tools as the gzipped
-tar file <a href="sql-bnf.tgz"> sql-bnf.tgz </a>.
--->
+You should be able to get the downloadable version of the latest release of this
+repository from the releases area —
+[https://github.com/ronsavage/SQL/releases/latest](https://github.com/ronsavage/SQL/releases/latest)
 
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