Drop 2.10 cross building

.travis.yml

@@ -16,8 +16,6 @@ matrix:
   include:
   - scala: 2.12.7
     jdk: openjdk11
-  - scala: 2.10.6
-    script: sbt -Dfile.encoding=UTF8 -J-XX:ReservedCodeCacheSize=256M "++$TRAVIS_SCALA_VERSION compile"
 
 env:
   global:

build.sbt

@@ -93,7 +93,7 @@ lazy val utilLogging = (project in internalPath / "util-logging")
   .dependsOn(utilInterface)
   .settings(
     commonSettings,
-    crossScalaVersions := Seq(scala210, scala211, scala212),
+    crossScalaVersions := Seq(scala211, scala212),
     name := "Util Logging",
     libraryDependencies ++=
       Seq(jline, log4jApi, log4jCore, disruptor, sjsonnewScalaJson.value, scalaReflect.value),

project/Dependencies.scala

@@ -3,7 +3,6 @@ import Keys._
 import sbt.contraband.ContrabandPlugin.autoImport._
 
 object Dependencies {
-  val scala210 = "2.10.7"
   val scala211 = "2.11.12"
   val scala212 = "2.12.8"