Correct misleading text in static_assert. Fixes issue #67.
Correct misleading text in static_assert. Fixes issue #67.

trebconnell/GSL,kernhanda/GSL,bashrc-real/GSL,neilmacintosh/GSL,kevgs/GSL,nguarracino/GSL,vladon/GSL,martinmoene/GSL,garyfurnish/GSL,Josaphat/GSL,eteran/GSL,matus-chochlik/GSL,jbcoe/GSL