pkg> registry add https://github.com/0h7z/0hjl.git
pkg> add Exts
julia> using Exts
julia> Exts.ext(:) # to see which extensions are loaded
8-element Vector{Pair{Symbol, Union{Nothing, Module}}}:
:Base => Exts.BaseExt
:DataFrames => DataFramesExt
:Dates => DatesExt
:FITSIO => FITSIOExt
:FITSIODataFrames => FITSIODataFramesExt
:Pkg => Exts.PkgExt
:Statistics => StatisticsExt
:YAML => YAMLExt