make cover need jq

[chemidy]

jq json parser is needed.

make cover
./etc/bin/cover.sh: line 72: jq: command not found

Maybe is it possible to add a check for jq on make init ?

[bufdev]

We could add an explicit check for it. The above looks like it sufficed to me, but happy to have an actual check with which.

[bufdev]

I wouldn't add to init though, I would add to the script. Init is just for initializing vendor, and might be a bad verb for the make target.

[bufdev]

Fixed in #67.