Update gradle plugin (fixes issue with proguard)

Author: Juraj Novák

build.gradle

@@ -3,7 +3,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:2.3.0'
     }
 }
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Wed Sep 14 09:54:42 CEST 2016
+#Mon Mar 13 13:06:15 CET 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.4-all.zip

library/build.gradle

@@ -25,7 +25,7 @@ android {
 }
 
 dependencies {
-    compile 'com.android.support:appcompat-v7:25.1.1'
+    compile 'com.android.support:appcompat-v7:25.2.0'
 }
 
 task androidJavadocs(type: Javadoc) {

sample/build.gradle

@@ -1,7 +1,7 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 24
+    compileSdkVersion 25
     buildToolsVersion '25.0.2'
 
     defaultConfig {
@@ -30,7 +30,7 @@ android {
 }
 
 dependencies {
-    compile 'com.android.support:appcompat-v7:25.1.1'
+    compile 'com.android.support:appcompat-v7:25.2.0'
     debugCompile 'com.squareup.leakcanary:leakcanary-android:1.4'
     releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.4'
     compile 'com.jakewharton:butterknife:5.1.2'