bump SDK to 27 along with build tools

build.gradle

@@ -60,16 +60,16 @@ allprojects {
 }
 
 android {
-    compileSdkVersion 26
-    buildToolsVersion '26.0.2'
+    compileSdkVersion 27
+    buildToolsVersion '27.0.3'
 
     defaultConfig {
         // Unfortunately 'com.android.support:appcompat-v7:26.0.0'
         // requires minSdkVersion 14, forcing a bump verson minSdkVersion 7
         // But since only 0.8% of Android devices have < SDK 14 as of Une 2017, this will become
         // the new min version for this library in order to target Android O
         minSdkVersion 14
-        targetSdkVersion 26
+        targetSdkVersion 27
         versionCode 1
         versionName version
         consumerProguardFiles 'proguard-rules.pro'
@@ -102,7 +102,7 @@ configurations {
 
 dependencies {
     compile fileTree ( dir: 'libs', include: ['*.jar'] )
-    compile 'com.android.support:support-v4:26.0.0'
+    compile 'com.android.support:support-v4:27.0.0'
     compile 'com.android.support:support-annotations:26.0.0'
 
     testCompile('junit:junit:4.12') {