fix: update LeakCanary + use ContextCompat color

Author: Kaushik Gopal

app/build.gradle

@@ -51,8 +51,8 @@ dependencies {
 
     // ----------------------------------
 
-    debugCompile 'com.squareup.leakcanary:leakcanary-android:1.3'
-    releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.3'
+    debugCompile 'com.squareup.leakcanary:leakcanary-android:1.5.1'
+    releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.5.1'
 }
 
 android {

app/src/main/java/com/morihacky/android/rxjava/fragments/FormValidationCombineLatestFragment.java

@@ -5,6 +5,7 @@
 
 import android.os.Bundle;
 import android.support.annotation.Nullable;
+import android.support.v4.content.ContextCompat;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -72,9 +73,11 @@ private void _combineLatestEvents() {
           @Override
           public void onNext(Boolean formValid) {
             if (formValid) {
-              _btnValidIndicator.setBackgroundColor(getResources().getColor(R.color.blue));
+              _btnValidIndicator.setBackgroundColor(
+                  ContextCompat.getColor(getContext(), R.color.blue));
             } else {
-              _btnValidIndicator.setBackgroundColor(getResources().getColor(R.color.gray));
+              _btnValidIndicator.setBackgroundColor(
+                  ContextCompat.getColor(getContext(), R.color.gray));
             }
           }