E0131 should say lifetime parameters when there's a lifetime

[Havvy]

error[E0131]: main function is not allowed to have type parameters
 --> src/main.rs:1:8
  |
1 | fn main<'a> () {}
  |        ^^^^ main cannot have type parameters

The error says type parameters when it should say lifetime parameters in this case.

This is definitely a low priority issue. Might make a good first issue though?

[simartin]

I propose to work on that one.