Update the changelog for the latest release

Author: FarmGeek4Life

docs/Changelog.html

@@ -13,6 +13,22 @@ <h1 class="pagetitle">MS-GF+ ChangeLog</h1>
         <a href="index.html">MS-GF+ Documentation home</a>
     </p>
 
+    <p>
+      <b>v2020.01.15</b>
+    </p>
+    <ul>
+      <li>Resolve a new issue with duplicate peptide ids in the mzid output (problem with 2 modifications rounding to the same integer mass)</li>
+      <li>Don't exit with exit code '0' when there is a parameter parsing error</li>
+      <li>Add additional example files to the documentation</li>
+    </ul>
+
+    <p>
+      <b>v2019.08.26</b>
+    </p>
+    <ul>
+      <li>Improve support for searching mgf files, particularly those containing spectra with no charge in the title</li>
+    </ul>
+
     <p>
       <b>v2019.07.03</b>
     </p>