Update CHANGELOG.md

CHANGELOG.md

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 ### 0.6.6 - 2015-05-29
+- Adds default purpose and size to button (and flag)
+- Swaps button tag to anchor tag when an href is passed in
+- Adds and click handler
+- Adds data attribute functionality.
+
 ### 0.6.5 - 2015-05-29
+- Adjust the tile component to utilise the image component
+- Adds some default styling for images
+- Spaces out the articles on docs better