Merge branch '5.0' into 5.1

* 5.0:
  [travis] display deprecations in nightly jobs

Author: nicolas-grekas

composer.json

@@ -17,7 +17,6 @@
     ],
     "require": {
         "php": ">=7.2.5",
-        "psr/log": "^1.0",
         "symfony/polyfill-php80": "^1.15"
     },
     "conflict": {