Polymake.jl 0.11.7 released

Today Polymake.jl 0.11.7 has been released.

Diff since v0.11.6

Merged pull requests:

• add compat bounds for stdlibs (in preparation for julia nightly) (#457) (@benlorenz)
• incidencematrix: constructor with dimensions (#458) (@benlorenz)
• Add tests for switch table (#459) (@lkastner)