Polymake.jl 0.8.3 released

Today Polymake.jl 0.8.3 has been released.

Diff since v0.8.2

Merged pull requests:

• windows: use wslviewer script for native visualization (#409) (@benlorenz)
• readme badges (#413) (@benlorenz)
• Extend interface for SparseVectorBool (#414) (@alexej-jordan)
• Remove unused where clause (#415) (@fingolfin)
• bump version to 0.8.3 (#416) (@benlorenz)