Upload package to Julia package index

[gregordecristoforo]

[gregordecristoforo]

@yaccos May I ask you to install the registrator github app for the HeterogeneousArrays.jl repository? This should take 1 minute. This isn't the only option but probably the cleanest way.

[yaccos]

The app is now installed.

[gregordecristoforo]

This issue is continued in #24