Correct composer.json

Composer "replace" part is not correct. See https://wiki.typo3.org/Composer for more info. At the current state, an extension directory "tinymce4-rte" is generated. After this change it's "tinymce4_rte".

composer.json

 {
-  "name": "sgalinski/tinymce4_rte",
+  "name": "sgalinski/tinymce4-rte",
   "type": "typo3-cms-extension",
   "description": "RTE integration of TinyMCE for TYPO3.",
   "homepage": "https://www.sgalinski.de",
@@ -12,8 +12,7 @@
     "typo3/cms-core": "*"
   },
   "replace": {
-    "tinymce4_rte": "*",
-    "sgalinski/tinymce4_rte": "*",
+    "tinymce4_rte": "self.version",
     "typo3-ter/tinymce4-rte": "self.version"
   },
   "autoload": {