patch 8.1.0742: not all Blob operations are tested

Problem:    Not all Blob operations are tested.
Solution:   Add more testing for Blob.
diff --git a/src/version.c b/src/version.c
index a7ed174..ec50b49 100644
--- a/src/version.c
+++ b/src/version.c
@@ -796,6 +796,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    742,
+/**/
     741,
 /**/
     740,