Add some __eq__

Needed as 088eea7 adds comparison of elements this makes sure that they
are compared by value instead of by reference.

CHANGES.rst

@@ -28,6 +28,8 @@ Bug fixes:
   [jacadzaca]
 - Use non legacy timezone name.
   Ref: #567
+- Add some compare functions.
+  Ref: #568
 
 5.0.10 (unreleased)
 -------------------

src/icalendar/prop.py

@@ -257,6 +257,11 @@ def from_ical(ical, timezone=None):
             out.append(vDDDTypes.from_ical(ical_dt, timezone=timezone))
         return out
 
+    def __eq__(self, other):
+        if not isinstance(other, vDDDLists):
+            return False
+        return self.dts == other.dts
+
 
 class vCategory:
 
@@ -865,6 +870,11 @@ def from_ical(cls, ical):
             return -offset
         return offset
 
+    def __eq__(self, other):
+        if not isinstance(other, vUTCOffset):
+            return False
+        return self.td == other.td
+
 
 class vInline(str):
     """This is an especially dumb class that just holds raw unparsed text and