Remove the point builder, it was obsoleted by the series builder

Also update the usage examples in the README file

Author: Enric Sala

README.md

@@ -57,49 +57,33 @@ influxdb.setWriteTimeout(10);
 Writing data
 ------------
 
-Use the `Point` builder to create samples, then save them in a batch:
+Use the `Series` builder to prepare the data, then write it using the client:
 
 ```matlab
-% Create a point
-p1 = Point('weather') ...
+% Create a series with a single sample
+series1 = Series('weather') ...
     .tags('city', 'barcelona', 'country', 'catalonia') ...
     .fields('temperature', 24.3, 'humidity', 70.4) ...
-    .time(datetime('now', 'TimeZone', 'local'));
+    .time(datetime('today', 'TimeZone', 'local'));
 
-% Create another point
-p2 = Point('weather') ...
+% Create a series with many samples
+series2 = Series('weather') ...
     .tags('city', 'copenhagen', 'country', 'denmark') ...
-    .fields('temperature', 12.6, 'humidity', 45.7) ...
-    .time(datetime('now', 'TimeZone', 'local'));
-
-% Create an array of points
-array = [p3, p4, etc];
-
-% Save all the points
-influxdb.writer() ...
-    .append(p1, p2, etc) ...
-    .append(array) ...
-    .execute();
-```
-
-It is possible to save *large* amounts of samples using the `Series` builder:
-
-```matlab
-% Create a series with many points
-series1 = Series('weather') ...
-    .tags('city', 'stockholm', 'country', 'sweden') ...
-    .fields('temperature', [10.5; 11.2; 9.7]) ...
-    .time(datetime('now', 'TimeZone', 'local') - [0; 1; 2] / 24);
+    .fields('temperature', [12.6; 11.8], 'humidity', [45.7; 46.3]) ...
+    .time(datetime('now', 'TimeZone', 'local') - [0; 1] / 24);
 
 % Create a series from an existing timetable
-ttable = timetable(time, variables, etc);
-series2 = Series('weather') ...
+series3 = Series('weather') ...
     .tags('city', 'helsinki', 'country', 'finland') ...
-    .import(ttable);
+    .import(my_timetable);
+
+% Create an array of series
+series_array = [series4, series5, etc];
 
-% Save the series
+% Save all the series in a batch
 influxdb.writer() ...
-    .append(series1, series2) ...
+    .append(series1, series2, series3) ...
+    .append(series_array) ...
     .execute();
 ```
 
@@ -112,7 +96,7 @@ influxdb.writer() ...
     .precision('ms') ...
     .retention('two_weeks') ...
     .consistency('quorum') ...
-    .append(points, series) ...
+    .append(series, etc) ...
     .execute();
 ```