Update release notes and release date.

documentation/RELEASE_NOTES.html

@@ -15,10 +15,13 @@
 
 <h1>Release 6.0.1</h1>
 
-<p>The only change since release 6.0.0 is:</p>
+<p>The changes since release 6.0.0 are:</p>
 
 <ul>
 <li>Fix "Problem building pvDataCPP for win32-x86-mingw" (issue #42)</li>
+<li>In src/misc/bitSet.cpp #include <algorithm> required for MSVS 2015</li>
+<li>In testApp/misc/testTypeCast.cpp print (u)int8 values as integers</li>
+<li>Minor documentation updates</li>
 </ul>
 
 <h1>Release 6.0.0</h1>