Latest version changes behaviour for the base_uri and documentation is not updated

[michiel-nwa]

The latest version adds a non-backward compatible change to passing the base URI in the constructor.

Documentation says you should pass:

sp = SparkPost('YOUR API KEY', 'https://api.eu.sparkpost.com')

which is also what we are using for over a year. But in 1.3.9 the constructor actually expects it to be:

SparkPost('YOUR API KEY', 'api.eu.sparkpost.com')

as the constructor adds the 'https://' by itself, without backward compatibility check to see if it might have been added already.