v0.4.2

UpdateJulia v0.4.2

Diff since v0.4.1

Closed issues:

• How to chang the installation path？ (#19)
• trouble installing to bin="~/bin" under linux (#23)

Merged pull requests:

• Make update_julia(1.1) install 1.1, not 1.1x (e.g. 1.10) (#21) (@LilithHafner)
• Fix installation of nightly on MacOS (#22) (@LilithHafner)
• Add tilde expansion for install_location and bin (#24) (@LilithHafner)
• Release 0.4.2 (#25) (@LilithHafner)