Drop Travis and Appveyor CI setting (#195)

Author: peter279k

.travis.yml

@@ -1,7 +1,5 @@
 # Zipkin PHP
 
-[![Build Status](https://travis-ci.org/openzipkin/zipkin-php.svg?branch=master)](https://travis-ci.org/openzipkin/zipkin-php)
-[![Build status](https://ci.appveyor.com/api/projects/status/f02q896uv1m3crg1?svg=true)](https://ci.appveyor.com/project/jcchavezs/zipkin-php)
 ![CI](https://github.com/openzipkin/zipkin-php/workflows/CI/badge.svg)
 [![Latest Stable Version](https://poser.pugx.org/openzipkin/zipkin/v/stable)](https://packagist.org/packages/openzipkin/zipkin)
 [![Coverage Status](https://coveralls.io/repos/github/openzipkin/zipkin-php/badge.svg)](https://coveralls.io/github/openzipkin/zipkin-php)
@@ -262,11 +260,11 @@ class TraceClient implements ClientInterface
         $span = $this->tracer->nextSpan();
         $span->setKind(Zipkin\Kind\CLIENT);
         $span->tag(Tags\HTTP_PATH, $uri);
-        
+
         try {
             $response = $this->client->request($method, $uri, $options);
             $span->tag(Tags\HTTP_STATUS_CODE, $response->getStatusCode());
-            
+
             return $response;
         catch (Throwable $e) {
             $span->setError($e);