No-Jira: try to clean up and close socket (#67)

* No-Jira: try to clean up and close socket
so that garbage collection doesn't complain

* No-Jira: move warning to constructor

Author: Li Xu

rosette/api.py

@@ -112,9 +112,12 @@ def validate(cls, value, name):
 
 class MorphologyOutput(_PseudoEnum):
     """ Class to provide Morphology sub-endpoints """
-    warnings.warn('MorphologyOutput to be removed in version 1.9.0. '
-                  'Please use API.morphology_output',
-                  DeprecationWarning)
+
+    def __init__(self):
+        warnings.warn('MorphologyOutput to be removed in version 1.9.0. '
+                      'Please use API.morphology_output',
+                      DeprecationWarning)
+
     LEMMAS = "lemmas"
     PARTS_OF_SPEECH = "parts-of-speech"
     COMPOUND_COMPONENTS = "compound-components"
@@ -605,6 +608,9 @@ def __init__(
             'TRANSLITERATION': 'transliteration'
         }
 
+    def __del__(self):
+        self.session.close()
+
     def _set_pool_size(self):
         adapter = requests.adapters.HTTPAdapter(
             pool_maxsize=self.max_pool_size)