Singular.jl 0.4.7 released

Today Singular.jl 0.4.7 has been released.

Diff since v0.4.6

Closed issues:

• crash on fractions over Nemo (#349)
• ? Dynamic modules are not supported by this version of Singular (#383)
• ? Dynamic modules are not supported by this version of Singular (#384)

Merged pull requests:

• Bump Nemo/AA dependencies (#389) (@thofma)
• Bump version to 0.4.7 (#390) (@thofma)