[TASK] Adapt the composer.json and ext_emconf for TYPO3 8

composer.json

@@ -4,7 +4,7 @@
 	"description": "RTE integration of TinyMCE for TYPO3.",
 	"homepage": "https://www.sgalinski.de",
 	"license": "GPL-2.0+",
-	"version": "2.2.4",
+	"version": "3.0.0",
 	"support": {
 		"issues": "https://forge.typo3.org/projects/extension-tinymce4_rte"
 	},
@@ -16,7 +16,7 @@
 	],
 	"require": {
 		"typo3/cms-core": "7.6.0 - 8.7.99",
-		"sgalinski/tinymce": "dev-typo3v8compatibility"
+		"sgalinski/tinymce": "^5.0"
 	},
 	"replace": {
 		"tinymce4_rte": "self.version",

ext_emconf.php

@@ -4,7 +4,7 @@ $EM_CONF[$_EXTKEY] = [
 	'title' => 'TinyMCE4 as TYPO3 RTE',
 	'description' => 'RTE integration of TinyMCE for TYPO3.',
 	'category' => 'be',
-	'version' => '2.2.4',
+	'version' => '3.0.0',
 	'state' => 'stable',
 	'uploadfolder' => FALSE,
 	'createDirs' => '',
@@ -20,9 +20,9 @@ $EM_CONF[$_EXTKEY] = [
 		[
 			'depends' =>
 				[
-					'php' => '5.5.0-7.0.99',
-					'typo3' => '7.6.4-8.7.99',
-					'tinymce' => '4.3.4-4.4.99',
+					'php' => '7.0.0-7.1.99',
+					'typo3' => '7.6.0-8.7.99',
+					'tinymce' => '5.0.0-5.0.99',
 				],
 			'conflicts' =>
 				[