Merge #612: rustfmt: Use now config option fn_params_layout

7467b23 rustfmt: Use now config option fn_params_layout (Tobin C. Harding)

Pull request description:

  `rustfmt` warns:

   Warning: the `fn_args_layout` option is deprecated. Use
   `fn_params_layout`. instead

  As suggested, use now config option `fn_params_layout`.

ACKs for top commit:
  apoelstra:
    ACK 7467b23

Tree-SHA512: c786607200f550839300234d72e387e76e648b51ccebb96d8fc7a3b607b1702e8410dca486930cf71321f7e0a0546ad55f589da58395c8b3e86d783b40f776a7

Author: apoelstra

rustfmt.toml

@@ -53,7 +53,7 @@ enum_discrim_align_threshold = 0
 match_arm_blocks = false        # Default true
 match_arm_leading_pipes = "Never"
 force_multiline_blocks = false
-fn_args_layout = "Tall"
+fn_params_layout = "Tall"
 brace_style = "SameLineWhere"
 control_brace_style = "AlwaysSameLine"
 trailing_semicolon = true