Update project files

traccar-client/build.gradle

@@ -1,12 +1,12 @@
 apply plugin: 'android'
 
 android {
-    compileSdkVersion 19
-    buildToolsVersion "19.0.3"
+    compileSdkVersion 21
+    buildToolsVersion "21.1.2"
 
     defaultConfig {
         minSdkVersion 3
-        targetSdkVersion 19
+        targetSdkVersion 21
         versionCode 20
         versionName "3.0"
     }
@@ -22,7 +22,7 @@ android {
 
     buildTypes {
         release {
-            runProguard false
+            minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
             signingConfig signingConfigs.release
         }