Update composer.json: renommage package + suppression clé repositories inutile.

composer.json

 {
-    "name": "unicaen/unicaen-leocarte",
+    "name": "unicaen/leocarte",
     "description": "Module de communication avec le web service des Leocartes",
-    "repositories": [
-        {
-            "type": "composer",
-            "url": "https://dev.unicaen.fr/packagist"
-        }
-    ],
     "require": {
         "ext-soap":                                 "*",
         "ext-gd":                                   "*",