patch 8.2.3603: fish filetype not recognized

Problem:    Fish filetype not recognized.
Solution:   Add a file pattern and match script line. (Doug Kearns)
diff --git a/runtime/filetype.vim b/runtime/filetype.vim
index 8fd2fc0..875823c 100644
--- a/runtime/filetype.vim
+++ b/runtime/filetype.vim
@@ -617,6 +617,9 @@
 " Fetchmail RC file
 au BufNewFile,BufRead .fetchmailrc		setf fetchmail
 
+" Fish shell
+au BufNewFile,BufRead *.fish			setf fish
+
 " FlexWiki - disabled, because it has side effects when a .wiki file
 " is not actually FlexWiki
 "au BufNewFile,BufRead *.wiki			setf flexwiki
diff --git a/runtime/scripts.vim b/runtime/scripts.vim
index 79fd0a7..0ff8e49 100644
--- a/runtime/scripts.vim
+++ b/runtime/scripts.vim
@@ -194,6 +194,10 @@
   elseif s:name =~# 'rsc\>'
     set ft=routeros
 
+    " Fish shell
+  elseif s:name =~# 'fish\>'
+    set ft=fish
+
   endif
   unlet s:name