Update README.md

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@ -9,7 +9,10 @@ A major change was required to deal with some API changes found in Zabbix 5.4.
- Some parameters moved under "params" in JSON.
- Care is taken about Some (unneccessry) warnings and index errors due to lack of testing of information available.
To upgrade from v1.x to v2.0 you only have to replace mailGraph.php. No changes made to other files in this release.
To upgrade from v1.x to v2.00 you only have to replace mailGraph.php. No changes made to other files in this release.
## IMPORTANT NOTE ##
As a result of a major functional change in Zabbix 5.4 (Screens no longer exist and are all moved into Dashboards) the mailGraph.screen macro no longer functions under Zabbix 5.4+. A code rewrite is in progress to deal with detecting the Zabbix version and to pick dashboard.get instead of screen.get as a source list for the graphs that should be included in the mail message.
## Minor bugfixes to the code (2021/10/06)
Code improvements to prevent possible errors leading into a non-functional mailGraph ... (typical error within log or Zabbix: "json error").