Fix python 3 support

Fix #94

pymisp/api.py

@@ -49,12 +49,20 @@ def deprecated(func):
 
     @functools.wraps(func)
     def new_func(*args, **kwargs):
+        if sys.version_info < (3, 0):
             warnings.warn_explicit(
                 "Call to deprecated function {}.".format(func.__name__),
                 category=DeprecationWarning,
                 filename=func.func_code.co_filename,
                 lineno=func.func_code.co_firstlineno + 1
             )
+        else:
+            warnings.warn_explicit(
+                "Call to deprecated function {}.".format(func.__name__),
+                category=DeprecationWarning,
+                filename=func.__code__.co_filename,
+                lineno=func.__code__.co_firstlineno + 1
+            )
         return func(*args, **kwargs)
     return new_func