Update spatie/sheets requirement from ^1.4 to ^1.6

[dependabot-preview[bot]]

Updates the requirements on spatie/sheets to permit the latest version.

Release notes

Sourced from spatie/sheets's releases.

1.6.0

• allow to directly pass the collection name into sheets()

Changelog

Sourced from spatie/sheets's changelog.

1.6.0 - 2020-06-26

• allow to directly pass the collection name into sheets()

1.5.1 - 2020-06-22

• Improve CommonMark interface bindings

1.5.0 - 2020-05-25

• Add Laravel 7 support

1.4.0 - 2020-10-07

• Add support for JSON and YAML files with JsonParser and YamlParser

1.3.1 - 2019-09-09

• Fixed Str import for Laravel 6

1.3.0 - 2019-09-03

• Add support for Laravel 6.0
• Allow league/commonmark versions 0.19 and 1.0

1.2.3 - 2019-02-27

• Add support for Laravel 5.8

1.2.2 - 2018-11-28

• Allow latest league/commonmark version

1.2.1 - 2018-09-04

• Add support for Laravel 5.7

1.2.0 - 2018-06-08

• Implement Arrayable, Jsonable & JsonSerializable on the Sheet class

1.1.0 - 2018-06-05

• Implement ArrayAccess on the Sheet class

1.0.0 - 2018-05-31

• First release

Commits

• c0d0980 Update CHANGELOG.md
• 2b65a67 Merge pull request #57 from Gummibeer/ft-shorter-sheets-collection-helper
• aeb40ca add integration tests
• 78b7fd7 use common repository interface as return type
• fe20532 allow to directly pass the collection name into sheets() helper function
• 1b52441 Update changelog
• 08d850e bind commonmark as singleton to all interfaces (#55)
• db33364 Update README.md (#54)
• ccf7a68 Update README with new "Support us" section
• 750c1c1 Update changelog
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #55.