Update readme for the v4.0

Author: LaurentPetard

README.md

@@ -4,12 +4,13 @@ A simple PHP client to use the [Akeneo PIM API](https://api.akeneo.com/).
 
 Matrix compatibility:
 
-| PIM version(s)     | API PHP Client version  |CI status                                                                                                                 |
-|--------------------|-------------------------|--------------------------------------------------------------------------------------------------------------------------|
-| v2.0               | v1.0                    |[![Build Status](https://travis-ci.org/akeneo/api-php-client.svg?branch=1.0)](https://travis-ci.org/akeneo/api-php-client)|
-| v2.1 - v2.2        | v2.0                    |[![Build Status](https://travis-ci.org/akeneo/api-php-client.svg?branch=2.0)](https://travis-ci.org/akeneo/api-php-client)|
-| v2.3               | v3.0                    |[![Build Status](https://travis-ci.org/akeneo/api-php-client.svg?branch=3.0)](https://travis-ci.org/akeneo/api-php-client)|
-| -                  | master                  |[![Build Status](https://travis-ci.org/akeneo/api-php-client.svg?branch=master)](https://travis-ci.org/akeneo/api-php-client)|
+| PIM version(s)  | API PHP Client version  | End of life    | CI status                                                                                                                    |
+|-----------------|-------------------------|----------------|------------------------------------------------------------------------------------------------------------------------------|
+| v2.0            | v1.0                    |  March 2019    | [![Build Status](https://travis-ci.org/akeneo/api-php-client.svg?branch=1.0)](https://travis-ci.org/akeneo/api-php-client)   |
+| v2.1 - v2.2     | v2.0                    |  March 2019    | [![Build Status](https://travis-ci.org/akeneo/api-php-client.svg?branch=2.0)](https://travis-ci.org/akeneo/api-php-client)   |
+| v2.3            | v3.0                    |  December 2019 | [![Build Status](https://travis-ci.org/akeneo/api-php-client.svg?branch=3.0)](https://travis-ci.org/akeneo/api-php-client)   |
+| v3.0            | v4.0                    |  August 2020   | [![Build Status](https://travis-ci.org/akeneo/api-php-client.svg?branch=4.0)](https://travis-ci.org/akeneo/api-php-client)   |
+| -               | master                  |  -             | [![Build Status](https://travis-ci.org/akeneo/api-php-client.svg?branch=master)](https://travis-ci.org/akeneo/api-php-client)|
 
 Note that our PHP client is backward compatible.
 For example, if your PIM is currently a v2.3, you can still use a 1.0 version of the PHP client. The new endpoints available in v2.3 will not be available in the v1.0 of the PHP client.