bump the version up to 0.9.1

Author: dnl-blkv

setup.py

@@ -24,7 +24,7 @@
     # Versions should comply with PEP440.  For a discussion on single-sourcing
     # the version across setup.py and the project code, see
     # https://packaging.python.org/en/latest/single_source_version.html
-    version='0.9.0',
+    version='0.9.1',
 
     description='bunq Python SDK',
     long_description=long_description,