[TASK] Update typo3 version requirement

composer.json

@@ -9,7 +9,7 @@
 		"issues": "https://forge.typo3.org/projects/extension-tinymce"
 	},
 	"require": {
-		"typo3/cms-core": "^7.6"
+		"typo3/cms-core": "7.6.0 - 8.7.99"
 	},
 	"replace": {
 		"tinymce": "self.version",

ext_emconf.php

@@ -21,7 +21,7 @@ $EM_CONF[$_EXTKEY] = [
 			'depends' =>
 				[
 					'php' => '5.5.0-0.0.0',
-					'typo3' => '6.2.0-7.6.99',
+					'typo3' => '6.2.0-8.7.99',
 				],
 			'conflicts' => [],
 			'suggests' => [],