Update README

@@ -2,7 +2,7 @@
 
 [![Build Status](https://travis-ci.org/DavBfr/dart_pdf.svg?branch=master)](https://travis-ci.org/DavBfr/dart_pdf)
 
-This set of plugin allows Flutter apps to generate and print pdf files to device printer. This plugin works for iOS and Android.
+This set of plugins allows Flutter apps to generate and print pdf files to the device printer. This plugin works for iOS and Android.
 
 * dart pdf: <https://pub.dev/packages/pdf>
 * flutter printing: <https://pub.dev/packages/printing>

-# Pdf creation library for dart / flutter
+# Pdf creation library for dart/flutter
 
-This library is divided in two parts:
+This library is divided into two parts:
 
 * a low-level Pdf creation library that takes care of the pdf bits generation.
 * a Widgets system similar to Flutter's, for easy high-level Pdf creation.
 
 It can create a full multi-pages document with graphics,
-images and text using TrueType fonts. With the ease of use you already know.
+images, and text using TrueType fonts. With the ease of use you already know.
 
 <img alt="Example document" src="https://raw.githubusercontent.com/DavBfr/dart_pdf/master/pdf/example.jpg">
 
@@ -16,7 +16,7 @@ for full flutter print and share operation.
 The coordinate system is using the internal Pdf unit:
 
 * 1.0 is defined as 1 / 72.0 inch
-* you can use the constants for centimeters, millimeters and inch defined in PdfPageFormat
+* you can use the constants for centimeters, millimeters, and inch defined in PdfPageFormat
 
 [![Buy Me A Coffee](https://bmc-cdn.nyc3.digitaloceanspaces.com/BMC-button-images/custom_images/orange_img.png "Buy Me A Coffee")](https://www.buymeacoffee.com/JORBmbw9h "Buy Me A Coffee")
 

 # Printing
 
-Plugin that allows Flutter apps to generate and print
+A plugin that allows Flutter apps to generate and print
 documents to android or ios compatible printers
 
 See the example on how to use the plugin.
 
 <img alt="Example document" src="https://raw.githubusercontent.com/DavBfr/dart_pdf/master/printing/example.png" width="300">
 
-This example is also available on the web here: <https://davbfr.github.io/dart_pdf/>
+This example is also available on the web here: <https://davbfr.github.io/dart_pdf/>.
 
 This plugin uses the `pdf` package <https://pub.dev/packages/pdf>
 for pdf creation. Please refer to <https://pub.dev/documentation/pdf/latest/>
@@ -78,7 +78,7 @@ Or share the document to other applications:
 await Printing.sharePdf(bytes: pdf.save(), filename: 'my-document.pdf');
 ```
 
-To print an HTML document, simply do:
+To print an HTML document:
 
 ```dart
 await Printing.layoutPdf(