Always print progress

[taiki-e]

Currently, progress is only printed when some options were specified (see #32), but I think it's better to always print it.

Before:

$ cargo hack check --all
info: running `cargo check` on member1
...
info: running `cargo check` on member2
...
info: running `cargo check` on member3
...

After

$ cargo hack check --all
info: running `cargo check` on member1 (1/3)
...
info: running `cargo check` on member2 (2/3)
...
info: running `cargo check` on member3 (3/3)
...

[taiki-e]

bors r+

[bors]

Build succeeded:

• ci