Note that instead of keeping usage of the old API for Symfony <2.6, I decided to bump the symfony/console requirement to 2.7 (and so I simplified the other place doing such support for pre-2.6 versions).
The version 2.4, 2.5 and 2.5 (which are excluded by my change) are unmaintained since years.
I also added the proper exit code in message:sender when some messages are failing
The TableHelper is gone in Symfony 3.
Note that instead of keeping usage of the old API for Symfony <2.6, I decided to bump the symfony/console requirement to 2.7 (and so I simplified the other place doing such support for pre-2.6 versions). The version 2.4, 2.5 and 2.5 (which are excluded by my change) are unmaintained since years.
I also added the proper exit code in
message:sender
when some messages are failing