Set revison number to 2.2.0.

ChangeLog

+2023-03-06  Uwe Schulzweida
+
+        * using CGRIBEX library version 2.1.0
+        * using EXSE library version 1.5.0
+	* Version 2.2.0 released
+
 2023-02-05  Uwe Schulzweida
 
 	* changed chunkSizeLim from 16777216 to 1048576

configure.ac

@@ -7,7 +7,7 @@
 AC_PREREQ([2.69])
 LT_PREREQ([2.4.6])
 
-AC_INIT([cdi],[2.1.1],[https://mpimet.mpg.de/cdi])
+AC_INIT([cdi],[2.2.0],[https://mpimet.mpg.de/cdi])
 AC_DEFINE_UNQUOTED(CDI, ["$PACKAGE_VERSION"], [CDI version])
 
 AC_CONFIG_AUX_DIR([config])