Fix dependency on seld/jsonlint 1.4

As deprecated flag is used.

composer.json

@@ -26,7 +26,7 @@
         "justinrainbow/json-schema": "^3.0 || ^4.0 || ^5.0",
         "composer/ca-bundle": "^1.0",
         "composer/semver": "^1.0",
-        "composer/spdx-licenses": "^1.0",
+        "composer/spdx-licenses": "^1.2",
         "seld/jsonlint": "^1.4",
         "symfony/console": "^2.7 || ^3.0 || ^4.0",
         "symfony/finder": "^2.7 || ^3.0 || ^4.0",