Updated idt-installer, #127

[henrycunh]

Made Pop!_OS compatible with the apt-get installation.
Referring to issue #127.

[flotwig]

Would be great if this could get merged.

[preachermanx]

Another way is to use lsb_release -i which returns
Distributor ID: Ubuntu on Pop_OS! and
Distributor ID: CentOS on CentOS varients.
#127

[vzool]

Another way is to use lsb_release -i which returns
Distributor ID: Ubuntu on Pop_OS! and
Distributor ID: CentOS on CentOS varients.
#127

I tested and it gives me different output:

$ lsb_release -i
Distributor ID:	Pop

#182