build(deps): update clap_lex requirement from =0.5.0 to =0.6.0

[dependabot[bot]]

Updates the requirements on clap_lex to permit the latest version.

Changelog

Sourced from clap_lex's changelog.

v0.6.0 (2015-04-13)

Bug Fixes

• tests fix failing doc tests (3710cd69)

Features

• app add support for building args from usage strings (d5d48bcf)
• args add ability to create basic arguments from a usage string (ab409a8f)

v0.5.14 (2015-04-10)

Bug Fixes

• usage
  • remove unneeded space (51372789)
  • remove warning about unused variables (ba817b9d)

Features

• usage add ability to get usage string for subcommands too (3636afc4)

v0.5.13 (2015-04-09)

Features

• SubCommands add method to get name and subcommand matches together (64e53928)
• ArgMatches add method to get default usage string (02462150)

v0.5.12 (2015-04-08)

Features

• help sort arguments by name so as to not display a random order (f4b2bf57)

v0.5.11 (2015-04-08)

... (truncated)

Commits

• 38b5a2f chore: Release
• e485448 docs: Update changelog
• f801a03 Merge pull request #5181 from alexcrichton/smaller-is-number
• 9a9aabc refactor: Reduce code size of testing tokens if they're a number
• 1b84314 Merge pull request #5176 from epage/dep
• dcced5a chore: Bump completest
• f4319bc Merge pull request #5174 from kpreid/patch-1
• 71c1e59 docs: Fix doc link to Arg::trailing_var_arg
• deebc1f Merge pull request #5172 from epage/style
• dfebb54 style: Make clippy happy
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like clap_lex is no longer a dependency, so this is no longer needed.