Merge branch 'auth-fix'

src/client.js

@@ -60,6 +60,7 @@ ClearbitClient.prototype.request = function (options) {
     {
       timeout: options.stream ? 60000 : 5000,
       username: this.key,
+      password: '',
       user_agent: 'ClearbitNode/v' + pkg.version
     }
   )

test/client.js

@@ -118,7 +118,7 @@ describe('Client', function () {
     it('sends a basic auth header', function () {
       mock
         .get('/v1/people/email/bvdrucker@gmail.com')
-        .matchHeader('Authorization', 'Basic aw==')
+        .matchHeader('Authorization', 'Basic azo=')
         .reply(202);
       return client.request({
         api: 'person',