Update composer.json

composer.json

@@ -3,8 +3,8 @@
   "description": "Class to generate scrypt password hashes that are compatible with the wg/scrypt Java implementation",
   "require": {
     "php": "^5.6 || ^7.0",
-    "zendframework/zend-crypt": "~2.*",
-    "zendframework/zend-math": "~2.*"
+    "zendframework/zend-crypt": "2.*",
+    "zendframework/zend-math": "2.*"
   },
   "suggest": {
     "ext-scrypt": "This module will be excruciatingly slow without it."