added python 3

Author: dacoex

docs/sphinx/source/whatsnew/v0.3.0.txt

@@ -52,7 +52,7 @@ Bug fixes
   (:issue:`105`)
 * Fixed the metadata key specification in documentation of the
   readtmy2 function.
-* Fixes the import of tkinter (:issue:`112`)
+* Fixes the import of tkinter on Python 3 (:issue:`112`)
 
 
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