Document version attribute in the Prism class (#14)

* Add version to the docstring for the Prism class

* Add version attribute to examples in README.md

* Change default version of Prism API to v1

Author: CurtLH

README.md

@@ -70,7 +70,8 @@ p = prism.Prism(
     os.getenv("workday_tenant_name"),
     os.getenv("prism_client_id"), 
     os.getenv("prism_client_secret"),
-    os.getenv("prism_refresh_token")
+    os.getenv("prism_refresh_token"),
+    version="v1"
 )
 
 # create the bearer token
@@ -108,7 +109,8 @@ p = prism.Prism(
     os.getenv("workday_tenant_name"),
     os.getenv("prism_client_id"),
     os.getenv("prism_client_secret"),
-    os.getenv("prism_refresh_token")
+    os.getenv("prism_refresh_token"),
+    version="v2"
 )
 
 # create the bearer token

prism/prism.py

@@ -58,9 +58,12 @@ class Prism:
 
     refresh_token : str
         The Refresh Token for your registered API client
+
+    version : str
+        The version of the Prism API to use
     """
 
-    def __init__(self, base_url, tenant_name, client_id, client_secret, refresh_token, version="v2"):
+    def __init__(self, base_url, tenant_name, client_id, client_secret, refresh_token, version="v1"):
         """Init the Prism class with required attribues."""
         self.base_url = base_url
         self.tenant_name = tenant_name