Add a method to series result for converting to a table

Author: Enric Sala

README.md

@@ -170,8 +170,9 @@ time = weather.time('Europe/Amsterdam');
 temperature = weather.field('temperature');
 plot(time, temperature);
 
-% Convert a series to a timetable
-ttable = weather.timetable('Europe/Paris');
+% Convert a series to a table or timetable
+mytable = weather.table();
+mytable = weather.timetable('Europe/Paris');
 ```
 
 Notice that the `time()` and `timetable()` methods take an optional timezone argument.

influxdb-client/SeriesResult.m

@@ -50,6 +50,12 @@
             values = obj.Values(idx).value;
         end
 
+        % Convert to a table
+        function result = table(obj)
+            vars = {obj.Values.value};
+            result = table(vars{:}, 'VariableNames', obj.fields());
+        end
+        
         % Convert to a timetable, with an optional timezone
         function ttable = timetable(obj, timezone)
             if nargin > 1