patch 8.2.1523: still not enough test coverage for the spell file handling

Problem:    Still not enough test coverage for the spell file handling.
Solution:   Add spell file tests. (Yegappan Lakshmanan, closes #6790)
diff --git a/src/version.c b/src/version.c
index 10f577b..f977e28 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1523,
+/**/
     1522,
 /**/
     1521,