Update sebastian/phpcpd requirement from ^5.0 to ^6.0

[dependabot-preview]

Updates the requirements on sebastian/phpcpd to permit the latest version.

Changelog

Sourced from sebastian/phpcpd's changelog.

[6.0.1] - 2020-08-13

Fixed

• The --verbose CLI option had no effect

[6.0.0] - 2020-08-13

Removed

• The --names CLI option has been removed; use the --suffix CLI option instead
• The --names-exclude CLI option has been removed; use the --exclude CLI option instead
• The --regexps-exclude CLI option has been removed
• The --progress CLI option has been removed

[5.0.2] - 2020-02-22

Changed

• Require sebastian/version version 3 and phpunit/php-timer version 3 to allow Composer-based installation alongside phploc/phploc version 6 and phpunit/phpunit version 9

[5.0.1] - 2020-02-20

Fixed

• Fixed #181: --min-lines, --min-tokens, and --fuzzy commandline options do not work

[5.0.0] - 2020-02-20

Removed

• Removed support for PHP versions older than PHP 7.3

[4.1.0] - 2018-09-17

Added

• Implemented #117: Report average and maximum length of code clone

Changed

• The text logger now prints code clones sorted by size (in descending order)

[4.0.0] - 2018-01-02

Removed

• Removed support for PHP versions older than PHP 7.1

[3.0.1] - 2017-11-16

Commits

• cf724b9 Prepare release
• aaf59ee Add missing configuration for --verbose CLI option
• 8dd7990 Prepare release
• 98cc5f2 Rewrite CLI frontend
• 6102963 Bump
• 8cbcbe0 Cleanup
• 9d36e20 Enable colors
• 42389b5 Move
• 250185e Sync
• a45a387 Update tools
• Additional commits viewable in compare view

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