[MacPorts] #35866: rebar: update to 2.0.0

[MacPorts]

#35866: rebar: update to 2.0.0
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 Reporter:  ryandesign@…             |       Owner:  mail@…          
     Type:  update                   |      Status:  new             
 Priority:  Normal                   |   Milestone:                  
Component:  ports                    |     Version:  2.1.2           
 Keywords:  haspatch                 |        Port:  rebar           
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Comment(by ryandesign@…):

 Do you know into what directory we would want to copy the sample config
 file? (Where would rebar look for the real config file?)
 ${prefix}/etc/${name}? ${prefix}/share/examples/${name}? Elsewhere?

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Ticket URL: <https://trac.macports.org/ticket/35866#comment:2>
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