[m-rev.] for review: Update vim syntax for integer literal suffixes.

[Julien Fischer]

On Sat, 7 Apr 2018, Peter Wang wrote:

> vim/syntax/mercury.vim:
>    Accept suffixes on binary, octal, decimal and hexadecimal integer
>    literals (i, u, i8, u8, i16, u16, i32, u32, i64, u64),
>    with optional leading underscores.
>
>    Match integer and float literals only if they end at a word
>    boundary.

That's fine.

Julien.