fix some compiler warnings

// FREEBIE

SignalServiceKit/src/Messages/OWSMessageSender.m

@@ -1158,7 +1158,7 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
     NSMutableArray *messagesArray = [NSMutableArray arrayWithCapacity:recipient.devices.count];
     
     NSData *plainText = [message buildPlainTextData];
-    DDLogDebug(@"%@ built message: %@ plainTextData.length: %lu", self.tag, [message class], plainText.length);
+    DDLogDebug(@"%@ built message: %@ plainTextData.length: %lu", self.tag, [message class], (unsigned long)plainText.length);
 
     for (NSNumber *deviceNumber in recipient.devices) {
         @try {

SignalServiceKit/src/Storage/TSYapDatabaseObject.h

@@ -19,6 +19,7 @@
  *  @return Initialized object
  */
 - (instancetype)initWithUniqueId:(NSString *)uniqueId NS_DESIGNATED_INITIALIZER;
+- (instancetype)initWithCoder:(NSCoder *)coder NS_DESIGNATED_INITIALIZER;
 
 /**
  *  Returns the collection to which the object belongs.