update change log

Author: gcanti

CHANGELOG.md

@@ -13,13 +13,18 @@
 ## v0.4.0
 
 - **Breaking Change**
-    - drop support for RN < 0.13.0
+    - required react-native version >= 0.20.0
 - **New Feature**
     - add support for Switch (Android), fix #60 (thanks @alvaromb)
+    - Support for Android date and time pickers, fix #67 (thanks @alvaromb)
     - add support for webpack, fix #23
 - **Documentation**
     - How to clear form after submit (thanks @shashi-dokania)
     - Dynamic forms example: how to change a form based on selection
+    - Stylesheet guide (docs/STYLESHEET.md)
+- **Polish**
+    - add travis CI
+    - add ISSUE_TEMPLATE.md (new GitHub feature)
 
 ## v0.3.3
 

README.md

@@ -932,6 +932,8 @@ The following standard options are available (see http://facebook.github.io/reac
 
 ## Stylesheets
 
+See also [Stylesheet guide](docs/STYLESHEET.md).
+
 tcomb-form-native comes with a default style. You can customize the look and feel by setting another stylesheet:
 
 ```js