Polymake.jl 0.3.3 released

Today Polymake.jl 0.3.3 has been released.

Diff since v0.3.2

Closed issues:

• Error in printing of cones (#244)
• Julia 1.4 library compatibility problem on Linux. (#250)
• Polymake.jl doesn’t work if user has too new C++ library (#251)

Merged pull requests:

• Mention DFG funding in README (#248) (@fingolfin)
• Enh/docstring polymake jl (#249) (@kalmarek)
• fix #251: adjust ostringstream constructor for recent libstdc++ (#252) (@benlorenz)