Update overtrue/phplint requirement from ^1.1 to ^2.3

Updates the requirements on overtrue/phplint to permit the latest version.

Commits

7debe31 Merge pull request #88 from ttomdewit/master
7032f31 Update LintCommand.php
1ca0bd2 Update LintCommand.php
c9b02ef Allow to silenty fail when --quiet/-q option is used (for use in CI)
dcbb1b9 Merge pull request #85 from BackEndTea/feature/warn-on-deprecations-and-notices
c93d0b8 Update Dockerfile
5d453bb Allow to lint for deprecations and notices as well
11f1ac8 Merge pull request #84 from BackEndTea/feature/warning
8ea28ba Allow to lint for warnings
36f3726 Merge pull request #82 from blar/alpine
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odan / slim4-skeleton

Update overtrue/phplint requirement from ^1.1 to ^2.3 #39