news.md in red-arrow-0.4.0

- old
+ new

@@ -1,6 +1,13 @@
 # News
 
+## 0.4.0 - 2017-05-18
+
+### Improvements
+
+  * `Arrow::StringArray#[]`: Changed to return `String` instead of
+    `GLib::Bytes`.
+
 ## 0.3.1 - 2017-05-17
 
 ### Improvements
 
   * `Arrow::MemoryMappedInputStream`: Renamed from