title: Pact File upload to pact broker failing
body: <p>Issue of "Failed to read pacts: NullPointerException" while uploading pact file into the pact broker. Below is my stack trace and POM file details.
  Please help. 
  Below is my stack trace</p>
  
  <pre><code>  [INFO] loading pacts from target/pacts
  [INFO] found pact file: PRODUCT-CART.json
  [INFO] ------------------------------------------------------------------------
  [INFO] BUILD FAILURE
  [INFO] ------------------------------------------------------------------------
  [INFO] Total time: 0.476 s
  [INFO] Finished at: 2017-10-03T15:09:20+08:00
  [INFO] Final Memory: 11M/243M
  [INFO] ------------------------------------------------------------------------
  [ERROR] Failed to execute goal com.github.warmuuh:pactbroker-maven-plugin:0.0.9:upload-pacts (default-cli) on project Auth_Api_Consumer: Failed to read pacts: NullPointerException -&gt; [Help 1]
  org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.github.warmuuh:pactbroker-maven-plugin:0.0.9:upload-pacts (default-cli) on project Auth_Api_Consumer: Failed to read pacts
      at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
      at 
  </code></pre>
  
  <p>Below is my POM.xml</p>
  
  <pre><code>                &lt;plugin&gt;
                      &lt;groupId&gt;com.github.warmuuh&lt;/groupId&gt;
                      &lt;artifactId&gt;pactbroker-maven-plugin&lt;/artifactId&gt;
                      &lt;version&gt;0.0.9&lt;/version&gt;
                      &lt;executions&gt;
                      &lt;!--CONSUMER Upload Pact File Starts --&gt;    
                          &lt;execution&gt;
                            &lt;id&gt;upload-pacts&lt;/id&gt;
                            &lt;phase&gt;test&lt;/phase&gt;
                            &lt;goals&gt;&lt;goal&gt;upload-pacts&lt;/goal&gt;&lt;/goals&gt;
                            &lt;configuration&gt;
                             &lt;brokerUrl&gt;http://localhost:8080/&lt;/brokerUrl&gt;
                             &lt;!-- &lt;brokerUrl&gt;git@scm.hue.workslan:tools/hue-contract-testing.git&lt;/brokerUrl&gt; --&gt;
                              &lt;pacts&gt;${project.build.directory}/pacts&lt;/pacts&gt;
                            &lt;/configuration&gt;
                          &lt;/execution&gt;
                      &lt;!--CONSUMER Upload Pact File Ends --&gt;
                          &lt;/executions&gt;
                  &lt;/plugin&gt;
  </code></pre>