Improve written rc file

src/rc.ml

@@ -198,7 +198,7 @@ object (self)
       } |> sexp_of_basic_rc
       |> Sexp.to_string_hum
     in
-    let data = String.concat [ rc_header ; "\n\n\n" ; body ] in
+    let data = String.concat [ rc_header ; "\n\n\n" ; body ; "\n" ] in
     Out_channel.write_all name ~data
   (** Write rc file at instantiation. Entries should be changed in group, to
    * avoid multiple writing. Although, there is some cache done by out_channels,