Update request.js

fix: Spelling in new test description.

Author: bkuker

test/request.js

@@ -189,7 +189,7 @@ describe('request', function () {
         .then(done, done);
     });
 
-    it('agent can be used to set default baerer authentication', function (done){
+    it('agent can be used to set default bearer authentication', function (done){
       var agent = request.agent('https://httpbin.org');
       agent.set("Authorization", "Bearer test_bearer");