[TASK] Add Daniel and Łukasz as co-maintainers (#960)

Also change Oliver Klee from "developer" to "maintainer" (which better
describes the role).

Also change the author company to the Best Practices Team, as this is
the team that currently is maintaing the extension, and the TYPO3 Trainer
Network has been disbanded.

composer.json

@@ -17,7 +17,19 @@
 			"name": "Oliver Klee",
 			"email": "typo3-coding@oliverklee.de",
 			"homepage": "https://www.oliverklee.de",
-			"role": "developer"
+			"role": "maintainer"
+		},
+		{
+			"name": "Daniel Siepmann",
+			"email": "coding@daniel-siepmann.de",
+			"homepage": "https://daniel-siepmann.de/",
+			"role": "maintainer"
+		},
+		{
+			"name": "Łukasz Uznański",
+			"email": "lukaszuznanski94@gmail.com",
+			"homepage": "https://uznanski.pl/",
+			"role": "maintainer"
 		}
 	],
 	"homepage": "https://extensions.typo3.org/extension/tea/",

ext_emconf.php

@@ -17,9 +17,9 @@ $EM_CONF[$_EXTKEY] = [
     'state' => 'stable',
     'uploadfolder' => false,
     'createDirs' => '',
-    'author' => 'Oliver Klee',
+    'author' => 'Oliver Klee, Daniel Siepmann, Łukasz Uznański',
-    'author_email' => 'typo3-coding@oliverklee.de',
+    'author_email' => 'typo3-coding@oliverklee.de, coding@daniel-siepmann.de, lukaszuznanski94@gmail.com',
-    'author_company' => 'TYPO3 Trainer Network',
+    'author_company' => 'TYPO3 Best Practices Team',
     'autoload' => [
         'psr-4' => [
             'TTN\\Tea\\' => 'Classes/',