Travis does not check symbol if only DCM file is changed

[antoniovazquezblanco]

See KiCad/kicad-symbols#1551

It seems that the Travis scripts do not detect change when only the DCM file is changed. Example at KiCad/kicad-symbols#1490, only the new symbols of the PR have been checked by Travis.

[poeschlr]

Well do we want the symbol to be checked if only the description is updated? I am not so sure here. (The user did not touch the symbol. Why should they be responsible to fix old issues?)

[antoniovazquezblanco]

Anyways, the tool should at least notify the librarians that it has been changed so that we can review the changes.