v0.4.2

JustPIC v0.4.2

Diff since v0.4.1

Merged pull requests:

• Add phase ratio calculations (#132) (@albert-de-montserrat)
• Use CellArraysIndexing.jl to index CellArrays (#133) (@albert-de-montserrat)
• add pure shear test in 2D (#134) (@tduretz)
• Fix docs & PhaseRatio on GPUs (#136) (@albert-de-montserrat)
• Quickpatch: fix ALE script & unit test (#137) (@albert-de-montserrat)
• Bump minor (#138) (@albert-de-montserrat)