Update troubleshooting.md

Author: schmunk42

guide/development/troubleshooting.md

@@ -111,6 +111,13 @@ Login docker CLI
 - check shared memory settings for *Selenium* container (`/dev/shm`)
 - removed unnecessary host-volumes 
 
+#### Failing Mailcatcher tests
+
+Use a tagged image matching the codeception module version
+
+    image: tophfr/mailcatcher:0.6.5_2
+
+
 #### `chown` commands in Dockefile
 
 For every file, which is "chownd" a copy is created...
@@ -169,4 +176,4 @@ Running `docker-compose` on Windows can be painfully, because at least up to ver
 
 As a workaround you can use `docker exec -it appname_php_1 bash` to start a bash in a PHP container.
 
-We recommend to run Docker CLI tools from a Linux VM on Windows.
+We recommend to run Docker CLI tools from a Linux VM on Windows.