circle.yml: Unshallow brew
circle.yml: Unshallow brew

Prevent tab.runtime_dependencies from returning nil
because it thinks brew version < 1.1.6.

heuermh/homebrew-science,quantumsteve/homebrew-science,pditommaso/homebrew-science,philippbayer/homebrew-science,andrewjpage/homebrew-science,dpo/homebrew-science