Update nom requirement from 2.0.0 to 5.0.1

[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 - 2019-06-24

This version comes with a complete rewrite of nom internals to use functions as a base
for parsers, instead of macros. Macros have been updated to use functions under
the hood, so that most existing parsers will work directly or require minimal changes.

The CompleteByteSlice and CompleteStr input types were removed. To get different
behaviour related to streaming or complete input, there are different versions of some
parsers in different submodules, like nom::character::streaming::alpha0 and
nom::character::complete::alpha0.

The verbose-errors feature is gone, now the error type is decided through a generic
bound. To get equivalent behaviour to verbose-errors, check out nom::error::VerboseError

Thanks

• @​lowenheim helped in refactoring and error management
• @​Keruspe helped in refactoring and fixing tests
• @​pingiun, @​Songbird0, @​jeremystucki, @​BeatButton, @​NamsooCho, @​Waelwindows, @​rbtcollins, @​MarkMcCaskey for a lot of help in rewriting the documentation and adding code examples
• @​GuillaumeGomez for documentation rewriting and checking
• @​iosmanthus for bug fixes
• @​lo48576 for error management fixes
• @​vaffeine for macros visibility fixes
• @​webholik and @​Havvy for escaped and escaped_transform fixes
• @​proman21 for help on porting bits parsers

Added

• the VerboseError type accumulates position info and error codes, and can generate a trace with span information
• the lexical-core crate is now used by default (through the lexical compilation feature) to parse floats from text
• documentation and code examples for all functions and macros

Changed

• nom now uses functions instead of macros to generate parsers
• macros now use the functions under the hood
• the minimal Rust version is now 1.31
• the verify combinator's condition function now takes its argument by reference
• cond will now return the error of the parser instead of None
• alpha*, digit*, hex_digit*, alphanumeric* now recognize only ASCII characters

... (truncated)

Commits

• c326e07 bump version to 5.0.1
• c70065a fix error type inference in value!
• e913ebe fix peek reimplementation
• eef8080 fix return type in example
• 954114a Add missing use statement to "Code organization" parser example
• ab8277d add some documentation about the infinite loop check in many0 and many1
• 0b15ccd relax trait requirements on cut
• 2713fd8 deactivate cfg(doctest)
• 092df74 Fix meta variable misuse
• 14d2279 Fix custom_input_types.md
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #12.