patch 8.2.0316: ex_getln.c code has insufficient test coverage

Problem:    ex_getln.c code has insufficient test coverage.
Solution:   Add more tests. Fix a problem. (Yegappan Lakshmanan, closes #5693)
diff --git a/src/version.c b/src/version.c
index d4fe485..f10dcd5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    316,
+/**/
     315,
 /**/
     314,