build: update nom requirement from =5.0.0-alpha2 to =5.0.0-beta1

[dependabot-preview]

Updates the requirements on nom to permit the latest version.

Changelog

Sourced from nom's changelog.

Change Log

[Unreleased][unreleased]

Thanks

Added

Fixed

5.0.0 - ?

Thanks

Added

• the lexical-core crate is now used by default (through the lexical compilation feature) to parse floats from text

Fixed

Changed

• the verify combinator's condition function now takes its argument by reference
• cond will now return the error of the parser instead of None

Removed

• character parsers that were aliases to their *1 version: eol, alpha, digit, hex_digit, oct_digit, alphanumeric, space, multispace
• count_fixed macro
• whitespace::sp can be replaced by character::complete::multispace0
• method combinators are now in the nom-methods crate
• take_until_either, take_until_either1, take_until_either_and_consume and take_until_either_and_consume1: they can be replaced with is_not (possibly combined with something else)
• take_until_and_consume, take_until_and_consume1: they can be replaced with take_until combined with take
• sized_buffer and length_bytes!: they can be replaced with the length_data function
• non_empty, begin and rest_s function
• cond_reduce!, cond_with_error!, closure!, apply, map_res_err!, expr_opt!, expr_res!
• alt_complete, separated_list_complete, separated_nonempty_list_complete

4.2.3 - 2019-03-23

Fixed

• add missing build.rs file to the package
• fix code comparison links in changelog

4.2.2 - 2019-03-04

Fixed

• regression in do_parse macro import for edition 2018

... (truncated)

Commits

• df18168 bump version to 5.0.0-beta1
• 02e0b7a remove some warnings
• 79c4534 reformat the docs
• 23e37ae remove useless examples from the error management doc
• e342f90 move old error management code
• 4e597ba custom input types
• 7f28d1b update the combinators list guide
• 172eebc do not deny on missing_doc_code_examples
• 4434f7f last code examples
• ab5020c code example for flat_map!
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 83.284% when pulling aed012f on dependabot/cargo/nom-eq-5.0.0-beta1 into e056ac9 on master.