UPDATE.md in hyper_iterator-0.3.0 vs UPDATE.md in hyper_iterator-0.3.1

@@ -1,4 +1,18 @@
+### 3/23/17
+
+- Adding `Hash#each!` See the branch each-bang-hash
+- It seems to be significantly slower than the native `each`. hmmm why?
+
+### 3/18/17
+
+- Created [hyper_iterator-rails](https://github.com/EdmundLeex/hyper_iterator-rails) as 
+the adapter to Rails, since ActiveRecord implements its own `each` method
+- Added `HyperIterator.each!(array)` as a backup method. `each` is a widely implemented 
+method in many gems (e.g. the one we need to deal with is the pg gem). Because of that 
+adding this method that takes an array as argument can be more versatile without monkey 
+patching for each individual library.
+
 ### 3/16/17
 
 - Tweak the two benchmark file and made it work
 - This time around, I am dynamically creating new arrays and counting the number of 
 iterations before it blows up. And it's clear that the `each!` can complete more iteration 
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