remove cover.spec because it's making rebar sad
remove cover.spec because it's making rebar sad

Rebar is picking up both this cover.spec and the one in deps/pooler,
and this is making rebar unhappy.

Removing this for now until we can get rebar patched.

namjae/sqerl,eryx67/sqerl,chef/sqerl,chef/sqerl,namjae/sqerl,eryx67/sqerl