No need to cross-compile to two 2.12 versions (#281)

Author: ignasi35

build.sbt

@@ -6,7 +6,7 @@ lazy val commonSettings: Seq[Setting[_]] = Seq(
   organization := "net.debasishg",
   version := "3.40",
   scalaVersion := "2.13.6",
-  crossScalaVersions := Seq("2.12.14", "2.11.12", "2.10.7", "2.12.10"),
+  crossScalaVersions := Seq("2.12.14", "2.11.12", "2.10.7"),
 
   scalacOptions in Compile ++= Seq( "-unchecked", "-feature", "-language:postfixOps", "-deprecation" ),