patch 8.0.1837: one character cmdline abbreviation not triggered after '<,'>

Problem:    One character cmdline abbreviation not triggered after '<,'>.
Solution:   Skip over the special range. (Christian Brabandt, closes #2320)
diff --git a/src/version.c b/src/version.c
index feffa38..8012157 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1837,
+/**/
     1836,
 /**/
     1835,