Update support libs.

app/build.gradle

@@ -115,10 +115,10 @@ dependencies {
     compile project(':ical4android')
     compile project(':vcard4android')
 
-    compile 'com.android.support:appcompat-v7:25.+'
-    compile 'com.android.support:cardview-v7:25.+'
-    compile 'com.android.support:design:25.+'
-    compile 'com.android.support:preference-v14:25.+'
+    compile 'com.android.support:appcompat-v7:26.+'
+    compile 'com.android.support:cardview-v7:26.+'
+    compile 'com.android.support:design:26.+'
+    compile 'com.android.support:preference-v14:26.+'
 
     compile 'com.github.yukuku:ambilwarna:2.0.1'
     compile ('com.github.worker8:tourguide:1.0.17-SNAPSHOT@aar'){

build.gradle

@@ -10,6 +10,7 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.0.0'
@@ -22,6 +23,7 @@ allprojects {
         maven {
             url 'http://oss.sonatype.org/content/repositories/snapshots'
         }
+        google()
     }
 }