editorconfig: preserve final newline in YAML

I'm not sure why this is defaulted to `false` for all file types,
so this just enables it for YAML for now.

Signed-off-by: Milas Bowman <[email protected]>

Author: milas

.editorconfig

@@ -16,5 +16,8 @@ indent_size = 2
 indent_style = space
 indent_size = 4
 
+[*.{yaml}]
+insert_final_newline = true
+
 [Makefile]
 indent_style = tab