Updated readme file. Added new changelog records and updated compatible version to 3.8.1

Author: Eugene Manuilov

readme.txt

@@ -3,7 +3,7 @@ Contributors: madpixels, straightforward
 Donate link: http://goo.gl/hN9FYf
 Tags: chart, charts, charting, graph, graphs, graphing, visualisation, visualise data, visualization, visualize data, HTML5, canvas, pie chart, line chart, bar chart, column chart, gauge chart, area chart, scatter chart, candlestick chart, geo chart, google visualization api
 Requires at least: 3.5
-Tested up to: 3.8
+Tested up to: 3.8.1
 Stable tag: 1.4
 License: GPL v2.0 or later
 License URI: http://www.opensource.org/licenses/gpl-license.php
@@ -58,6 +58,10 @@ Pay attention that to turn your shortcodes into graphs, your theme has to have `
 
 == Changelog ==
 
+= 1.4.1 =
+* Fixed issue which prevents the plugin working on SSL backend
+* Fixed issue with CSV file uploading in IE and other browsers
+
 = 1.4 =
 * Implemented aggregation target and selection mode options for candlestick chart
 * Implemented focus target and data opacity for columnar chars