Polymake.jl 0.8.2 released

Today Polymake.jl 0.8.2 has been released.

Diff since v0.8.1

Merged pull requests:

• improve visual function (#408) (@benlorenz)
• Improve performance for conversions between common types (#410) (@alexej-jordan)
• init: user-directory via argument instead of ENV (#411) (@benlorenz)