add user management and examples

pymisp/api.py

@@ -11,10 +11,10 @@ import re
 import warnings
 
 try:
-    warnings.warn("You're using python 2, it is strongly recommended to use python >=3.3")
     from urllib.parse import urljoin
 except ImportError:
     from urlparse import urljoin
+    warnings.warn("You're using python 2, it is strongly recommended to use python >=3.3")
 from io import BytesIO
 import zipfile
 
@@ -31,8 +31,8 @@ from .mispevent import MISPEvent, MISPAttribute, EncodeUpdate
 
 # Least dirty way to support python 2 and 3
 try:
-    warnings.warn("You're using python 2, it is strongly recommended to use python >=3.3")
     basestring
+    warnings.warn("You're using python 2, it is strongly recommended to use python >=3.3")
 except NameError:
     basestring = str
 

pymisp/data/schema-lax.json

@@ -311,8 +311,7 @@
         }
       },
       "required": [
-        "info",
-        "Attribute"
+        "info"
       ]
     }
   },