Updated library versions

app/build.gradle

@@ -26,9 +26,9 @@ dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
 
     // support libraries
-    implementation "com.android.support:appcompat-v7:27.1.0"
-    implementation "com.android.support:design:27.1.0"
-    implementation "com.android.support:support-vector-drawable:27.1.0"
+    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'
 
     // rxjava