Merge pull request #74 from lhns/update/logback-classic-1.4.6

Update logback-classic to 1.4.6

build.sbt

@@ -8,7 +8,7 @@ name := (core.projectRefs.head / name).value
 val V = new {
  val betterMonadicFor = "0.3.1"
  val fastparse = "3.0.0"
- val logbackClassic = "1.4.5"
+ val logbackClassic = "1.4.6"
  val munit = "0.7.29"
  val munitTaglessFinal = "0.2.0"
 }