patch 9.1.0425: filetype: purescript files are not recognized

Problem:  filetype: purescript files are not recognized
Solution: recognize '*.purs' files as purescript filetype,
          include basic purescript filetype plugin
          (Riley Bruins)

Reference: https://github.com/purescript/documentation/blob/master/language/Syntax.md#comments

closes: #14813

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index fb14c2e..39327ca 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -577,6 +577,7 @@
     psl: ['file.psl'],
     pug: ['file.pug'],
     puppet: ['file.pp'],
+    purescript: ['file.purs'],
     pymanifest: ['MANIFEST.in'],
     pyret: ['file.arr'],
     pyrex: ['file.pyx', 'file.pxd'],
diff --git a/src/version.c b/src/version.c
index b10e501..7941f8a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    425,
+/**/
     424,
 /**/
     423,