updated NEWS for 2.2.1

darcs-hash:20100813173959-c8de0-51d24ce9ae04f383f7e6d9fa96f94bab3ba770a9.gz

NEWS

-NLopt 2.2.1 (5 August 2010)
+NLopt 2.2.1 (13 August 2010)
 
 * If you compile nlopt.h with the NLOPT_DLL_EXPORT symbol #defined,
   it now uses the dllexport directive (under Windows), useful for
@@ -11,6 +11,9 @@ NLopt 2.2.1 (5 August 2010)
 * Remove C99-style mixed declaration and code in a couple files, so
   that code compiles in C89; thanks to Benoit Scherrer for the bug report.
 
+* Removed a few compiler warnings under Microsoft compilers; thanks
+  to Benoit Scherrer for the bug report.
+
 * Don't use dllimport directive with lcc on Windows (which doesn't
   support it); thanks to Laurent Vanbeylen for the bug report.