Allow stable jaeger

Author: allflame

composer.json

@@ -11,7 +11,7 @@
     "symfony/config": "~2 || ~3 || ~4",
     "symfony/http-kernel": "~2 || ~3 || ~4",
     "symfony/dependency-injection": "~2 || ~3 || ~4",
-    "code-tool/jaeger-client-php": "~2.7",
+    "code-tool/jaeger-client-php": "@stable",
     "code-tool/jaeger-mongodb-collector": "~1"
   },
   "require-dev": {