build: set target sdk to version 28, update gradle

Clover/app/build.gradle

@@ -13,13 +13,13 @@ def getCommitHash = { ->
 }
 
 android {
-    compileSdkVersion 27
+    compileSdkVersion 28
     // update the travis config when changing this
     buildToolsVersion '28.0.3'
 
     defaultConfig {
         minSdkVersion 15
-        targetSdkVersion 25
+        targetSdkVersion 28
 
         versionName "v3.0.2"
         // of the format XXYYZZ, where XX is major, YY is minor, ZZ is patch
@@ -127,7 +127,7 @@ android {
 }
 
 dependencies {
-    def supportVersion = '27.1.1'
+    def supportVersion = '28.0.0'
 
     implementation "com.android.support:support-v13:${supportVersion}"
     implementation "com.android.support:appcompat-v7:${supportVersion}"

Clover/build.gradle

@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.1'
+        classpath 'com.android.tools.build:gradle:3.4.0'
     }
 }
 

Clover/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Sat Oct 06 14:30:14 CEST 2018
+#Sun Apr 21 13:06:50 CEST 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip