It seems that this function hasn't supported in mattgemmell / MGTwitterEngine yet.
In the meantime, you can add that function to your current version of MGTwitterEngine by referencing this variant of MGTwitterEngine:
freeatnet / MGTwitterEngine
-?(NSString?*)sendRetweet:(unsigned?long)updateID
{
??if?(updateID?==?0){
????return?nil;
??}
??NSString?*path?=?[NSString?stringWithFormat:@"statuses/retweet/%u.%@",?updateID,?API_FORMAT];
??return?[self?_sendRequestWithMethod:HTTP_POST_METHOD?path:path?
????????????????????????queryParameters:nil?body:nil?
????????????????????????????requestType:MGTwitterUpdateSendRequest
???????????????????????????responseType:MGTwitterStatus];
}
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