added if_none_match setter

MANIFEST

@@ -0,0 +1,42 @@
+# file GENERATED by distutils, do NOT edit
+coapclient.py
+coapforwardproxy.py
+coapreverseproxy.py
+coapserver.py
+exampleresources.py
+setup.cfg
+setup.py
+coapthon\__init__.py
+coapthon\defines.py
+coapthon\serializer.py
+coapthon\transaction.py
+coapthon\utils.py
+coapthon\caching\__init__.py
+coapthon\caching\cache.py
+coapthon\caching\coapcache.py
+coapthon\caching\coaplrucache.py
+coapthon\client\__init__.py
+coapthon\client\coap.py
+coapthon\client\helperclient.py
+coapthon\forward_proxy\__init__.py
+coapthon\forward_proxy\coap.py
+coapthon\layers\__init__.py
+coapthon\layers\blocklayer.py
+coapthon\layers\cachelayer.py
+coapthon\layers\forwardLayer.py
+coapthon\layers\messagelayer.py
+coapthon\layers\observelayer.py
+coapthon\layers\requestlayer.py
+coapthon\layers\resourcelayer.py
+coapthon\messages\__init__.py
+coapthon\messages\message.py
+coapthon\messages\option.py
+coapthon\messages\request.py
+coapthon\messages\response.py
+coapthon\resources\__init__.py
+coapthon\resources\remoteResource.py
+coapthon\resources\resource.py
+coapthon\reverse_proxy\__init__.py
+coapthon\reverse_proxy\coap.py
+coapthon\server\__init__.py
+coapthon\server\coap.py

coapthon/messages/request.py

@@ -178,6 +178,20 @@ class Request(Message):
                 return True
         return False
 
+    @if_none_match.setter
+    def if_none_match(self, value):
+        """
+        Set the If-Match option of a request.
+
+        :param value: True/False
+        :type values : bool
+        """
+        assert isinstance(value, bool)
+        option = Option()
+        option.number = defines.OptionRegistry.IF_NONE_MATCH.number
+        option.value = None
+        self.add_option(option)
+
     def add_if_none_match(self):
         """
         Add the if-none-match option to the request.