patch 9.0.0448: SubRip files are not recognized

Problem:    SubRip files are not recognized.
Solution:   Add a pattern for SubRip. (closes #11113)
diff --git a/src/version.c b/src/version.c
index da11368..2764ad9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    448,
+/**/
     447,
 /**/
     446,