Fix #30, removed use of deprecated `base64.decodestring` from docstrings
diff --git a/rsa/key.py b/rsa/key.py
index b659cc9..d530f33 100644
--- a/rsa/key.py
+++ b/rsa/key.py
@@ -143,7 +143,7 @@
 
         >>> import base64
         >>> b64der = 'MAwCBQCNGmYtAgMBAAE='
-        >>> der = base64.decodestring(b64der)
+        >>> der = base64.standard_b64decode(b64der)
 
         This loads the file:
 
@@ -333,7 +333,7 @@
 
         >>> import base64
         >>> b64der = 'MC4CAQACBQDeKYlRAgMBAAECBQDHn4npAgMA/icCAwDfxwIDANcXAgInbwIDAMZt'
-        >>> der = base64.decodestring(b64der)
+        >>> der = base64.standard_b64decode(b64der)
 
         This loads the file: