Polymake.jl 0.5.0 released

Today Polymake.jl 0.5.0 has been released.

Diff since v0.4.3

Closed issues:

• update binary dependencies to pkg artifacts (#209)
• Expand functionality of map macro (polyDB) (#314)

Merged pull requests:

• Documentation/new (#245) (@alexej-jordan)
• split libpolymake_julia into separate repo (#304) (@benlorenz)
• split libpolymake_julia and use artifacts (#308) (@benlorenz)
• Types/map (#309) (@alexej-jordan)
• choose fields when calling ‘map’ macro (polyDB) (#316) (@alexej-jordan)
• Cleanup Project.toml (#318) (@benlorenz)