Add (disabled) dependency on LeakCanary for debugging memory leaks

app/build.gradle

@@ -247,6 +247,9 @@ dependencies {
     final coroutines_version = '1.3.4'
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutines_version"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$coroutines_version"
+
+    // For detecting memory leaks; see https://square.github.io/leakcanary/
+//    debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.2'
 }
 
 buildscript {