Update ABI version numbers
diff --git a/src/nn.h b/src/nn.h
index 1370d2d..3fc3126 100644
--- a/src/nn.h
+++ b/src/nn.h
@@ -67,13 +67,13 @@
/* www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html */
/* The current interface version. */
-#define NN_VERSION_CURRENT 0
+#define NN_VERSION_CURRENT 1
/* The latest revision of the current interface. */
-#define NN_VERSION_REVISION 1
+#define NN_VERSION_REVISION 2
/* How many past interface versions are still supported. */
-#define NN_VERSION_AGE 0
+#define NN_VERSION_AGE 1
/******************************************************************************/
/* Errors. */
