Increment plugin API version for Jeff's patch.

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@1738 ea778897-0a13-0410-b9d1-a72fbfd435f5

src/plugindata.h

@@ -47,7 +47,7 @@
 
 /* The API version should be incremented whenever any plugin data types below are
  * modified. */
-static const gint api_version = 5;
+static const gint api_version = 6;
 
 /* The ABI version should be incremented whenever existing fields in the plugin
  * data types below have to be changed or reordered. It should stay the same if fields