patch 8.1.0687: sentence text object in Visual mode is not tested

Problem:    Sentence text object in Visual mode is not tested.
Solution:   Add a test. (Dominique Pelle, closes #3758)
diff --git a/src/version.c b/src/version.c
index 62edc78..e9ceeb5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    687,
+/**/
     686,
 /**/
     685,