Update scalafmt-core to 3.0.0

Author: 47erbot

.scalafmt.conf

@@ -1,4 +1,4 @@
-version=2.7.5
+version=3.0.0
 style = defaultWithAlign
 maxColumn = 100
 
@@ -15,9 +15,9 @@ align {
   openParenDefnSite = false
 }
 
-docstrings = JavaDoc
+docstrings.style = Asterisk
 
 rewrite {
   rules = [SortImports, RedundantBraces]
   redundantBraces.maxLines = 1
-}
+}

build.sbt

@@ -1,6 +1,6 @@
-ThisBuild / organization := "org.scala-exercises"
+ThisBuild / organization       := "org.scala-exercises"
 ThisBuild / githubOrganization := "47degrees"
-ThisBuild / scalaVersion := "2.13.3"
+ThisBuild / scalaVersion       := "2.13.3"
 ThisBuild / crossScalaVersions := Seq("2.13.3", "2.12.11")
 
 publish / skip := true