Bump DUK_VERSION to 2.2.1

Author: svaarala

src-input/duktape.h.in

@@ -38,7 +38,7 @@
  * development snapshots have 99 for patch level (e.g. 0.10.99 would be a
  * development version after 0.10.0 but before the next official release).
  */
-#define DUK_VERSION                       20200L
+#define DUK_VERSION                       20201L
 
 /* Git commit, describe, and branch for Duktape build.  Useful for
  * non-official snapshot builds so that application code can easily log