Pin dependencies

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
laravel/framework (source)	require-dev	pin	~5.1 -> 5.8.37
laravel/lumen-framework (source)	require-dev	pin	~5.1.6 -> 5.1.7
phpunit/phpunit (source)	require-dev	pin	~5.0 -> 5.7.27

:pushpin: Important: Renovate will wait until you have merged this Pin PR before creating any upgrade PRs for the affected packages. Add the preset :preserveSemverRanges your config if you instead don't wish to pin dependencies.

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