patch 8.2.3703: most people call F# "fsharp" and not "fs"

Problem:    Most people call F# "fsharp" and not "fs".
Solution:   Rename filetype "fs" to "fsharp".
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 3b875bb..f1966f4 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -187,7 +187,7 @@
     \ 'fpcmake': ['file.fpc'],
     \ 'framescript': ['file.fsl'],
     \ 'freebasic': ['file.fb', 'file.bi'],
-    \ 'fs': ['file.fs'],
+    \ 'fsharp': ['file.fs', 'file.fsi', 'file.fsx'],
     \ 'fstab': ['fstab', 'mtab'],
     \ 'fvwm': ['/.fvwm/file', 'any/.fvwm/file'],
     \ 'gdb': ['.gdbinit', 'gdbinit'],
@@ -977,7 +977,7 @@
 
   call writefile(['looks like F#'], 'Xfile.fs')
   split Xfile.fs
-  call assert_equal('fs', &filetype)
+  call assert_equal('fsharp', &filetype)
   bwipe!
 
   let g:filetype_fs = 'forth'
diff --git a/src/version.c b/src/version.c
index 302db8e..a190af5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3703,
+/**/
     3702,
 /**/
     3701,