Update changelog

h2/src/docsrc/html/changelog.html

@@ -21,6 +21,12 @@ Change Log
 
 <h2>Next Version (unreleased)</h2>
 <ul>
+<li>PR #1706: Add hypothetical set functions
+</li>
+<li>PR #1705: Fix GROUP_CONCAT with variable separator
+</li>
+<li>PR #1704: Fix return type of PERCENTILE_CONT and MEDIAN
+</li>
 <li>PR #1701: Add PERCENTILE_CONT and PERCENTILE_DISC inverse distribution functions
 </li>
 <li>Issues #1297, #1697: Failure on concurrent session closure