Updated constraint layout version

app/build.gradle

@@ -29,7 +29,7 @@ dependencies {
     implementation "com.android.support:appcompat-v7:27.1.1"
     implementation "com.android.support:design:27.1.1"
     implementation "com.android.support:support-vector-drawable:27.1.1"
-    implementation 'com.android.support.constraint:constraint-layout:1.1.0-beta6'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
 
     // rxjava
     implementation 'io.reactivex.rxjava2:rxjava:2.1.11'