Optimized code for prometheus which support https not only http. (#3009)

* Optimized code for prometheus which support `https` not only `http`.

* Update composer.json

* Format code.

Co-authored-by: 李铭昕 <715557344@qq.com>

Author: ushell

composer.json

@@ -23,7 +23,7 @@
         "hyperf/guzzle": "~2.1.0",
         "hyperf/utils": "~2.1.0",
         "jcchavezs/zipkin-opentracing":"^0.2.0",
-        "opentracing/opentracing":"^1.0"
+        "opentracing/opentracing":"1.0.0-beta6"
     },
     "require-dev": {
         "hyperf/event": "~2.1.0",