Removes flexbox duplicate in deps list and bumps version.
Removes flexbox duplicate in deps list and bumps version.

tachyons-flexbox ref is now at 1.2.0

topherauyeung/portfolio,topherauyeung/portfolio,getfrank/tachyons,topherauyeung/portfolio,tachyons-css/tachyons,pietgeursen/pietgeursen.github.io,matyikriszta/moonlit-landing-page,fenderdigital/css-utilities,cwonrails/tachyons,fenderdigital/css-utilities