Add *.lexs to ftdetect for Temple templates

Author: rktjmp

ftdetect/elixir.vim

@@ -1,5 +1,5 @@
 au BufRead,BufNewFile *.ex,*.exs set filetype=elixir
-au BufRead,BufNewFile *.eex,*.leex,*.sface set filetype=eelixir
+au BufRead,BufNewFile *.eex,*.leex,*.sface,*.lexs set filetype=eelixir
 au BufRead,BufNewFile mix.lock set filetype=elixir
 au BufRead,BufNewFile * call s:DetectElixir()