Fix Integer Format Specifier Problem (#380)

Since NSUInteger is variable size based on architecture, it’s best to cast the variable to an explictly sized unsigned long and use the appropriate format specifier

Author: JonathanDowning

Leanplum-SDK/Classes/Utilities/LPDatabase.m

@@ -148,7 +148,7 @@ - (sqlite3_stmt *)sqliteStatementFromQuery:(NSString *)query
                                    SQLITE_TRANSIENT);
 
         if (result != SQLITE_OK) {
-            NSString *message = [NSString stringWithFormat:@"SQLite fail to bind %@ to %ld", obj, idx+1];
+            NSString *message = [NSString stringWithFormat:@"SQLite fail to bind %@ to %lu", obj, (unsigned long)idx+1];
             [self handleSQLiteError:message errorResult:result query:query];
         }
     }];