doc: update 2020.1 release notes to include minor versions
<li>Some files generated by <em>goyacc</em> weren't recognized as being generated.</li>
<li><code>staticcheck</code> no longer fails to check packages that consist exclusively of tests.</li>
</ul>
+
+
+<h2 id="2020.1.1">Staticcheck 2020.1.1 release notes</h2>
+
+<p>
+ The 2020.1 release neglected to update the version string stored in
+ the binary, causing <code>staticcheck -version</code> to incorrectly emit <code>(no version)</code>.
+</p>
+
+<h2 id="2020.1.2">Staticcheck 2020.1.2 release notes</h2>
+
+<p>
+ The 2020.1.1 release incorrectly identified itself as version 2020.1.
+</p>
