Update sbt to 1.3.0

[scala-steward]

Updates org.scala-sbt:sbt from 1.1.6 to 1.3.0.

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

If you'd like to skip this version, you can just close this PR. If you have any feedback, just mention @scala-steward in the comments below.

Have a fantastic day writing Scala!

Ignore future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "org.scala-sbt", artifactId = "sbt" } ]

labels: semver-minor

[SethTisue]

[error] References to undefined settings: 
408[error] 
409[error]   scriptedBufferLog from Test / g8Test ((giter8.Giter8Plugin.giter8TestSettings) Giter8Plugin.scala:102)
410[error]      Did you mean Test / g8 / scriptedBufferLog ?
411[error] 
412[error]   scriptedLaunchOpts from scriptedLaunchOpts (/home/travis/build/scala/scalatest-example.g8/build.sbt:10)
413[error] 
414[error]   scriptedBufferLog from scripted ((sbt.ScriptedPlugin.projectSettings) ScriptedPlugin.scala:89)
415[error]      Did you mean Test / g8 / scriptedBufferLog ?
416[error]  
417[error] Use 'last' for the full log.
418Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore? 
419

[ashawley]

I raised giter8 templates as a comment in scala-steward-org/scala-steward#678

[SethTisue]

superseded by #13