Upgrade to Scala 2.12.10

Author: gzm0

.travis.yml

@@ -2,7 +2,7 @@ sudo: false
 language: scala
 scala:
   - 2.11.12
-  - 2.12.8
+  - 2.12.10
   - 2.13.1
 jdk:
   - openjdk8

build.sbt

@@ -2,7 +2,7 @@ inThisBuild(Seq(
   version := "1.0.0-SNAPSHOT",
   organization := "org.scala-js",
 
-  crossScalaVersions := Seq("2.12.8", "2.11.12", "2.13.1"),
+  crossScalaVersions := Seq("2.12.10", "2.11.12", "2.13.1"),
   scalaVersion := crossScalaVersions.value.head,
   scalacOptions ++= Seq("-deprecation", "-feature", "-Xfatal-warnings"),