Polymake.jl 0.3.2 released

Today Polymake.jl 0.3.2 has been released.

Diff since v0.3.1

Merged pull requests:

• SingularBuilder moved to oscar-system; update to latest version (#239) (@fingolfin)
• deps: switch from Nemo to LoadFlint (#240) (@benlorenz)
• supress banner in oscar (#241) (@fieker)
• bump version to 0.3.2 (#242) (@benlorenz)