patch 8.1.1812: reading a truncted undo file hangs Vim

Problem:    Reading a truncted undo file hangs Vim.
Solution:   Check for reading EOF. (closes #4769)
diff --git a/src/version.c b/src/version.c
index 32759b1..71a14ad 100644
--- a/src/version.c
+++ b/src/version.c
@@ -774,6 +774,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1812,
+/**/
     1811,
 /**/
     1810,