Pin to stable version of zend-expressive-authentication

- Using `^1.0-dev` enabled composer to pull in dev-master, which is not
  what we want.

Author: weierophinney

composer.json

@@ -26,7 +26,7 @@
         "psr/container": "^1.0",
         "psr/http-message": "^1.0.1",
         "webimpress/http-middleware-compatibility": "^0.1.1",
-        "zendframework/zend-expressive-authentication": "^0.2 || ^1.0-dev",
+        "zendframework/zend-expressive-authentication": "^0.2 || ^1.0",
         "zendframework/zend-expressive-router": "^2.2"
     },
     "require-dev": {