Update applications.py

Business_unit UUID bug. The API expects a String and UUID is not serializable. Attempting to use this method to create a new application results in a runtime exception.

Author: ashtonsyed

veracode_api_py/applications.py

@@ -94,7 +94,7 @@ def _create_or_update(self,method,app_name: str, business_criticality, descripti
             app_def.update({'teams': team_list})
 
         if business_unit != None:
-            bu = {'business_unit': {'guid': business_unit}}
+            bu = {'business_unit': {'guid': str(business_unit)}}
             app_def.update(bu)
 
         if (custom_fields != None):