fix #164 add MEMBER_REMOVED event and member_removed plugin python hook

deltachat-ffi/deltachat.h

@@ -4522,6 +4522,15 @@ int64_t          dc_lot_get_timestamp     (const dc_lot_t* lot);
  */
 #define DC_EVENT_MEMBER_ADDED 2063
 
+/**
+ * This event is sent for each member that gets removed from a (verified or unverified) chat. 
+ *
+ * @param data1 (int) chat_id
+ * @param data2 (int) contact_id
+ * @return 0
+ */
+#define DC_EVENT_MEMBER_REMOVED 2064
+
 /**
  * @}
  */

deltachat-ffi/src/lib.rs

@@ -203,6 +203,10 @@ impl ContextWrapper {
                 | Event::MemberAdded {
                     chat_id,
                     contact_id,
+                }
+                | Event::MemberRemoved {
+                    chat_id,
+                    contact_id,
                 } => {
                     ffi_cb(
                         self,