Add 2020.1.4 release notes

Author: dominikh

doc/2020.1.html

@@ -10,6 +10,7 @@
   <li><a href="#2020.1.1">Staticcheck 2020.1.1 release notes</a></li>
   <li><a href="#2020.1.2">Staticcheck 2020.1.2 release notes</a></li>
   <li><a href="#2020.1.3">Staticcheck 2020.1.3 release notes</a></li>
+  <li><a href="#2020.1.4">Staticcheck 2020.1.4 release notes</a></li>
 </ul>
 
 <h2 id="introduction">Introduction to Staticcheck 2020.1</h2>
@@ -192,3 +193,30 @@ <h2 id="2020.1.3">Staticcheck 2020.1.3 release notes</h2>
     </li>
   </ul>
 </p>
+
+<h2 id="2020.1.4">Staticcheck 2020.1.4 release notes</h2>
+
+<p>
+  This release adds special handling for imports of the
+  deprecated <code>github.com/golang/protobuf/proto</code> package.
+</p>
+
+<p>
+  <a href="https://github.com/golang/protobuf">github.com/golang/protobuf</a>
+  has deprecated the <code>proto</code> package, but
+  their <code>protoc-gen-go</code> still imports the package and uses
+  one of its constants, <q>to enforce a weak dependency on a
+  sufficiently new version of the legacy package</q>.
+</p>
+
+<p>
+  Staticcheck would flag the import of this deprecated package in all
+  code generated by protoc-gen-go. Instead of forcing the project to
+  change their project structure, we choose to ignore such imports in
+  code generated by protoc-gen-go. The import still gets flagged in code
+  not generated by protoc-gen-go.
+</p>
+
+<p>
+  You can find more information about this in the <a href="https://github.com/golang/protobuf/issues/1077">upstream issue</a>.
+</p>

doc/staticcheck.html

@@ -22,12 +22,12 @@ <h2 id="installation">Installation</h2>
 <p>
   If you use Go modules, you can simply run <code>go get honnef.co/go/tools/cmd/staticcheck</code> to obtain the latest released version.
   If you're still using a GOPATH-based workflow, then the above command will instead fetch the master branch.
-  It is suggested that you explicitly check out the latest release branch instead, which is currently <code>2020.1.3</code>.
+  It is suggested that you explicitly check out the latest release branch instead, which is currently <code>2020.1.4</code>.
   One way of doing so would be as follows:
 </p>
 
 <pre><code>cd $GOPATH/src/honnef.co/go/tools/cmd/staticcheck
-git checkout 2020.1.3
+git checkout 2020.1.4
 go get
 go install
 </code></pre>