patch 8.2.0360: yaml files are only recognized by the file extension

Problem:    Yaml files are only recognized by the file extension.
Solution:   Check for a line starting with "%YAML". (Jason Franklin)
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 7ea1a74..4531b2a 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -601,6 +601,7 @@
       \ 'haskell': [['#!/path/haskell']],
       \ 'cpp': [['// Standard iostream objects -*- C++ -*-'],
       \         ['// -*- C++ -*-']],
+      \ 'yaml': [['%YAML 1.2']],
       \ }
 
 func Test_script_detection()
diff --git a/src/version.c b/src/version.c
index e6c6bc9..6085320 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    360,
+/**/
     359,
 /**/
     358,