patch 8.1.0636: line2byte() gives wrong values with text properties

Problem:    line2byte() gives wrong values with text properties. (Bjorn Linse)
Solution:   Compute byte offsets differently when text properties were added.
            (closes #3718)
diff --git a/src/version.c b/src/version.c
index 0712bcc..b2dbe38 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    636,
+/**/
     635,
 /**/
     634,