Add hint for common issue "This version of ChromeDriver only supports…

… Chrome version" to README.md

README.md

@@ -70,6 +70,14 @@ Run phpunit tests
 
     docker-compose exec php7.2 vendor/bin/phpunit
 
+If you run into issues of type ```session not created: This version of ChromeDriver only supports Chrome version 79```
+then it is because of mismatched versions between installed chrome driver and chromium.
+Best way to bypass this problem is to update them to their newest version.
+The first line could be sufficient but this depends on your actual setup. 
+
+    docker-compose exec php7.2 vendor/symfony/panther/chromedriver-bin/update.sh
+    docker-compose build php7.2
+
 ## Credits
 
 Created by Robert Freigang [robertfausk](https://github.com/robertfausk).