[MacPorts] #60201: beanshell: update to 2.0b6

[MacPorts]

#60201: beanshell: update to 2.0b6
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 Reporter:  chrstphrchvz  |      Owner:  (none)
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  beanshell
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 Port is currently at version 2.0b4, as when submitted in 2007. Upstream
 project is still active; latest release is 2.0b6 (released 2016).

 If this port is to be kept, its fallback dependency on deprecated port
 `kaffe` should be replaced with using the Java portgroup.

 (I personally do not need this port.)

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Ticket URL: <https://trac.macports.org/ticket/60201>
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