avoid deprecated method since sbt 0.13.13
``` build.sbt:168: warning: `<<=` operator is deprecated. Use `key := { x.value }` or `key ~= (old => { newValue })`. See http://www.scala-sbt.org/0.13/docs/Migrating-from-sbt-012x.html publishTo <<= version { (v: String) => ^ ``` |
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build.sbt |
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