CompatHelper: bump compat for JuliaFormatter to 0.15, (keep existing compat)#372

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compathelper/new_version/2021-08-14-00-46-01-982-01985852338JunoLab/Atom.jl:compathelper/new_version/2021-08-14-00-46-01-982-01985852338Copy head branch name to clipboard