Fix encoding bug, bump version

Author: hughtopping

MANIFEST

@@ -1,5 +1,5 @@
 # file GENERATED by distutils, do NOT edit
 setup.cfg
 setup.py
-spektrixpython\__init__.py
-spektrixpython\spektrixpython.py
+spektrixpython/__init__.py
+spektrixpython/spektrixpython.py

setup.py

@@ -3,12 +3,12 @@
     name = 'spektrixpython',
     packages = ['spektrixpython'],
     install_requires = ['requests'],
-    version = '0.3.0',
+    version = '0.4.0',
     description = 'A python module for interacting with Spektrix API v3.',
     author = 'Hugh Topping',
     author_email = 'hugh@hugh.io',
     url = 'https://github.com/hughtopping/spektrixpython',
-    download_url = 'https://github.com/hughtopping/spektrixpython/tarball/0.3.0',
+    download_url = 'https://github.com/hughtopping/spektrixpython/tarball/0.4.0',
     keywords = ['spektrix','api','v3'],
     license='MIT',
     classifiers = []

spektrixpython/spektrixpython.py

@@ -55,7 +55,7 @@ def _generate_auth_headers(self, payload=None):
         if self.method != 'GET':
             body_string = dumps(payload).encode('utf-8')
             body_string = md5(body_string).digest()
-            body_string = b64encode(body_string)
+            body_string = str(b64encode(body_string), 'utf-8')
 
             string_to_sign = string_to_sign + '\n' + body_string