Bump version to 0.2.6.
diff --git a/md4c/md4c.h b/md4c/md4c.h
index 5e14934..d8cca0f 100644
--- a/md4c/md4c.h
+++ b/md4c/md4c.h
@@ -33,7 +33,7 @@
#define MD_VERSION_MAJOR 0
#define MD_VERSION_MINOR 2
-#define MD_VERSION_RELEASE 5
+#define MD_VERSION_RELEASE 6
/* Magic to support UTF-16. */