Removing version limitation for pytest-cov
Removing version limitation for pytest-cov

astropy/astropy-helpers,Cadair/astropy-helpers,larrybradley/astropy-helpers,dpshelio/astropy-helpers,dpshelio/astropy-helpers,bsipocz/astropy-helpers,Cadair/astropy-helpers,astropy/astropy-helpers,larrybradley/astropy-helpers,bsipocz/astropy-helpers,bsipocz/astropy-helpers,larrybradley/astropy-helpers