updating kotlin, gradle, commons, removing LeakCanary

app/build.gradle

@@ -3,13 +3,13 @@ apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 
 android {
-    compileSdkVersion 27
-    buildToolsVersion "27.0.3"
+    compileSdkVersion 28
+    buildToolsVersion "28.0.2"
 
     defaultConfig {
         applicationId "com.simplemobiletools.filemanager"
         minSdkVersion 16
-        targetSdkVersion 27
+        targetSdkVersion 28
         versionCode 55
         versionName "4.2.0"
         setProperty("archivesBaseName", "file-manager")
@@ -40,17 +40,10 @@ android {
     }
 }
 
-ext {
-    leakCanaryVersion = '1.5.4'
-}
-
 dependencies {
-    implementation 'com.simplemobiletools:commons:4.6.10'
+    implementation 'com.simplemobiletools:commons:4.7.5'
 
     implementation files('../libs/RootTools.jar')
-
-    debugImplementation "com.squareup.leakcanary:leakcanary-android:$leakCanaryVersion"
-    releaseImplementation "com.squareup.leakcanary:leakcanary-android-no-op:$leakCanaryVersion"
 }
 
 Properties props = new Properties()

app/src/main/kotlin/com/simplemobiletools/filemanager/App.kt

@@ -3,18 +3,10 @@ package com.simplemobiletools.filemanager
 import android.app.Application
 import com.github.ajalt.reprint.core.Reprint
 import com.simplemobiletools.commons.extensions.checkUseEnglish
-import com.squareup.leakcanary.LeakCanary
 
 class App : Application() {
     override fun onCreate() {
         super.onCreate()
-        if (BuildConfig.DEBUG) {
-            if (LeakCanary.isInAnalyzerProcess(this)) {
-                return
-            }
-            LeakCanary.install(this)
-        }
-
         checkUseEnglish()
         Reprint.initialize(this)
     }

build.gradle

@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.2.60'
+    ext.kotlin_version = '1.2.61'
 
     repositories {
         jcenter()