Update phpstan/phpstan from 0.12.2 to 0.12.3

[violinist-bot]

If you have a high test coverage index, and your tests for this pull request are passing, it should be both safe and recommended to merge this update.

Here is a list of changes between the version you use, and the version this pull request updates to:

• c15a6ea5 PHPStan 0.12.3
• 65ab037c Updated PHPStan to commit 76f87603826741398d76c01262815b77b29c6723
• 3d97f45c Updated PHPStan to commit 0dfa0346f4afa2f916ef6963eebdb2ceb25eb6a1
• 97ae5eb8 Updated PHPStan to commit c3caa6cb01f440b55cd386cb736cddd9c56decf5
• 38b05ea7 Updated PHPStan to commit 41db2c908b1f57561e779d9cd81ea0022d78b28c
• a23f38c5 Updated PHPStan to commit fd2e954e5ed874ffe5ebb1b8f3794befe9c7c607
• 2a8de530 Updated PHPStan to commit a020fdc393829c92a1668d99a7e5e22b008fd49c
• ab118992 Updated PHPStan to commit 4f35d4d0c23960dcab69b48774e3655945b25a10
• 9ebb3c3e Updated PHPStan to commit 082848f003a0d1e9e6303d1e89276c2205170e0b
• e4c6fe96 Updated PHPStan to commit f56803d94d9368750266755f8fa4f627f63ae7d8
• 711c8ee9 Updated PHPStan to commit 3e2e245ef3f067b5674eacca1158310d36597fef
• 9cabec6b Updated PHPStan to commit f73a2f4fd127cffff60a87447bbf6ffd6349963e
• e818fb61 Trying to fix GitHub release
• df20aa27 Fix deploy
• 68b3ed7d Travis CI - automated releases
• 5f2f1fd8 Updated PHPStan to commit ffaed507ebca1ab57a5df06d60c6b4515e3a18f7
• 33bbc5df Updated PHPStan to commit 6c9b52e4892b2c61478de61ae793b25ee29bdd07
• ae0f884a Updated PHPStan to commit adb41f94120167d3b8ff7934295be091e77cadb4
• de58ccfa Updated PHPStan to commit 21e9c13a19b82e81ea56bc25b1e9a93942503573
• 300ee4e1 Updated PHPStan to commit a966f27167b9628a59584d6b40323c3c8caaef27
• 0d842908 Updated PHPStan to commit 3e4d7b3339f0fdc7f65af15881074c8d4f80f974
• 5559ab88 Fix: Rename reference after move to @ergebnis
• 2344f905 Updated PHPStan to commit fef038e0fe56acb3e0e454a5336330bb6398f8c4
• 757523a3 Updated PHPStan to commit 6fed6fbec01e4f2f757a07e36ab426a3b1278658

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