state: add __contains__

ch1p/__init__.py

@@ -1,2 +1,2 @@
 from .functions import telegram_notify
-from .state import State
+from .state import State

ch1p/state.py

@@ -39,6 +39,9 @@ class State:
     def __setitem__(self, key, value):
         self._data[key] = value
 
+    def __contains__(self, key):
+        return key in self._data
+
     def __delitem__(self, key):
         if key in self._data:
-            del self._data[key]
+            del self._data[key]

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = ch1p
-version = 0.0.5
+version = 0.0.6
 author = Evgeny Zinoviev
 author_email = me@ch1p.io
 description =