title: Getting gradle error with OneSignal in Android Studio
body: <p>I am trying to incorporate OneSignal in my Android project. Getting following gradle error which saying Support libraries must have same version.</p>
  
  <pre><code>dependencies {
  compile fileTree(dir: 'libs', include: ['*.jar'])
  androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
      exclude group: 'com.android.support', module: 'support-annotations'
  })
  compile 'com.android.support:appcompat-v7:25.3.1'
  compile 'com.android.support.constraint:constraint-layout:1.0.2'
  compile 'com.google.android.gms:play-services-ads:10.2.4'
  compile 'com.onesignal:OneSignal:[3.5.3,4.0.0)'
  testCompile 'junit:junit:4.12'
  </code></pre>
  
  <p>}</p>
  
  <p>Gradle giving error on <strong>compile 'com.android.support:appcompat-v7:25.3.1'</strong> and <strong>compile 'com.google.android.gms:play-services-ads:10.2.4'</strong> .</p>