patch 8.1.0266: parsing Ex address range is not a separate function

Problem:    Parsing Ex address range is not a separate function.
Solution:   Refactor do_one_cmd() to separate address parsing.
diff --git a/src/version.c b/src/version.c
index 9b39950..61dfc5f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    266,
+/**/
     265,
 /**/
     264,