changelog in readme

Author: ernestoarbitrio

README.md

@@ -77,4 +77,14 @@ response, filename = Data.download_series_instance_images(
                         name="filename.zip")
 ```
 NOTE: `path` and `name` are optional, by default path is your current directory and if name is 
-not provided it will be saved with the SOPInstanceUID as filename.
+not provided it will be saved with the SOPInstanceUID as filename.
+
+## Changelog
+
+### 0.1
+- TCGA Api endpoints
+
+### 0.2
+- Bug Fix on TCGA Apis
+- Public interface refactoring [breaking change]
+- TCIA Api endpoints