Bump symfony/process from 3.4.27 to 3.4.28

Bumps [symfony/process](https://github.com/symfony/process) from 3.4.27 to 3.4.28.
- [Release notes](https://github.com/symfony/process/releases)
- [Changelog](https://github.com/symfony/process/blob/master/CHANGELOG.md)
- [Commits](https://github.com/symfony/process/compare/v3.4.27...v3.4.28)

composer.lock

@@ -2951,16 +2951,16 @@
         },
         {
             "name": "symfony/process",
-            "version": "v3.4.27",
+            "version": "v3.4.28",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "a9c4dfbf653023b668c282e4e02609d131f4057a"
+                "reference": "afe411c2a6084f25cff55a01d0d4e1474c97ff13"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/process/zipball/a9c4dfbf653023b668c282e4e02609d131f4057a",
-                "reference": "a9c4dfbf653023b668c282e4e02609d131f4057a",
+                "url": "https://api.github.com/repos/symfony/process/zipball/afe411c2a6084f25cff55a01d0d4e1474c97ff13",
+                "reference": "afe411c2a6084f25cff55a01d0d4e1474c97ff13",
                 "shasum": ""
             },
             "require": {
@@ -2996,7 +2996,7 @@
             ],
             "description": "Symfony Process Component",
             "homepage": "https://symfony.com",
-            "time": "2019-04-08T16:15:54+00:00"
+            "time": "2019-05-22T12:54:11+00:00"
         },
         {
             "name": "theseer/tokenizer",