Update version number to pak 0.8.0

Increment version number to 0.7.2

Increment version number to 0.7.1

Increment version number to 0.7.0

Increment version number to 0.6.0

Nightly: need to install Rtools40

Not Rtools42. Also cleaner R version selection.

[ci skip]

Increment version number to 0.5.0

Increment version number to 0.4.0

Increment version number to 0.3.1

Increment version number to 0.3.0