Update composer.json : ZF ^2.4

composer.json

@@ -3,14 +3,14 @@
   "description": "Module Ldap des applications Unicaen",
   "require": {
     "php":                                  "^5.6 || ^7.0",
-    "zendframework/zend-servicemanager":    "~2.4 || ^2.7",
-    "zendframework/zend-modulemanager":     "~2.4 || ^2.7",
-    "zendframework/zend-config":            "~2.4 || ^2.7",
-    "zendframework/zend-serializer":        "~2.4 || ^2.7",
-    "zendframework/zend-log":               "~2.4 || ^2.7",
-    "zendframework/zend-i18n":              "~2.4 || ^2.7",
-    "zendframework/zend-stdlib":            "~2.4 || ^2.7",
-    "zendframework/zend-ldap":              "~2.4 || ^2.7"
+    "zendframework/zend-servicemanager":    "^2.4",
+    "zendframework/zend-modulemanager":     "^2.4",
+    "zendframework/zend-config":            "^2.4",
+    "zendframework/zend-serializer":        "^2.4",
+    "zendframework/zend-log":               "^2.4",
+    "zendframework/zend-i18n":              "^2.4",
+    "zendframework/zend-stdlib":            "^2.4",
+    "zendframework/zend-ldap":              "^2.4"
   },
   "require-dev": {
     "phpunit/PHPUnit": ">=3.7",