Update nom requirement from 3.2 to 5.0

[dependabot-preview]

Updates the requirements on nom to permit the latest version.

Changelog

Sourced from nom's changelog.

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

Removed

• deprecated string parsers (with the _s suffix), the normal version can be used instead
• verbose-errors is not needed anymore, now the error type can be decided when writing the parsers, and parsers provided by nom are generic over the error type
• AtEof, CompleteByteSlice and CompleteStr are gone, instead some parsers are specialized to work on streaming or complete input, and provided in different modules
• 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

... (truncated)

Commits

• be0a3fd bump version to 5.0.0
• 632ab59 fix build in no_std+alloc
• bcd2a62 remove debug log
• 56becd5 fix tests on no_std
• 3108cb6 do not panic in convert_error on empty input
• b16bbf3 only build overflow tests on 64 bits arch
• 26c5d3b remove outdated doc
• 0205b90 bump version to 5.0.0-beta3
• fd8acd3 separated_list, separated_nonempty_list: Document arguments in order
• 608aa8f add the value combinator as a function
• Additional commits viewable in compare view

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