libyang CHANGE review header includes

The plugins_types.h was supposed only for implementing data type plugins
code, so I've removed it from libyang.h (now it is supposed to be
included explicitly).
diff --git a/src/parser_lyb.c b/src/parser_lyb.c
index 74519a7..af74330 100644
--- a/src/parser_lyb.c
+++ b/src/parser_lyb.c
@@ -24,12 +24,14 @@
 #include "compat.h"
 #include "context.h"
 #include "dict.h"
+#include "hash_table.h"
+#include "in.h"
 #include "in_internal.h"
 #include "log.h"
 #include "parser_data.h"
 #include "parser_internal.h"
-#include "set.h"
 #include "tree.h"
+#include "tree_data.h"
 #include "tree_data_internal.h"
 #include "tree_schema.h"
 #include "validation.h"