patch 9.1.0275: filetype: R history files are not recognized

Problem:  filetype: R history files are not recognized
Solution: Detect '.Rhistory' files as r filetype
          (Wu, Zhenyu)

closes: #14440

Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index a26a3f0..6021e96 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -570,7 +570,7 @@
     qmldir: ['qmldir'],
     quake: ['anybaseq2/file.cfg', 'anyid1/file.cfg', 'quake3/file.cfg', 'baseq2/file.cfg', 'id1/file.cfg', 'quake1/file.cfg', 'some-baseq2/file.cfg', 'some-id1/file.cfg', 'some-quake1/file.cfg'],
     quarto: ['file.qmd'],
-    r: ['file.r', '.Rprofile', 'Rprofile', 'Rprofile.site'],
+    r: ['file.r', '.Rhistory', '.Rprofile', 'Rprofile', 'Rprofile.site'],
     racket: ['file.rkt', 'file.rktd', 'file.rktl'],
     radiance: ['file.rad', 'file.mat'],
     raku: ['file.pm6', 'file.p6', 'file.t6', 'file.pod6', 'file.raku', 'file.rakumod', 'file.rakudoc', 'file.rakutest'],
diff --git a/src/version.c b/src/version.c
index c54ec96..fb72324 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    275,
+/**/
     274,
 /**/
     273,