Update README.md

Zuluft · Nov 27, 2017 · 6ae3733 · 6ae3733
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diff --git a/README.md b/README.md
@@ -65,5 +65,6 @@ You can use ```SafeFragmentTransaction``` for child fragments too. Write the fol
  ```Java
 mSafeFragmentTransaction = SafeFragmentTransaction.createInstance(getLifecycle(),
                 getChildFragmentManager());
+getLifecycle().addObserver(mSafeFragmentTransaction);
 ```
 And use it as it is shown in  ```step 2```.