Add Scala 2.13.0-M4 to the CI, under Scala.js 0.6.x.

We switch from `Stream.iterate` to `Iterator.iterate` because the
former is deprecated in 2.13.0-M4.

Author: sjrd

.travis.yml

@@ -11,6 +11,7 @@ scala:
   - 2.11.12
   - 2.12.5
   - 2.13.0-M3
+  - 2.13.0-M4
 jdk:
   - oraclejdk8
 env:
@@ -20,6 +21,8 @@ matrix:
   exclude:
     - scala: 2.10.7
       env: SCALAJS_VERSION=1.0.0-M3
+    - scala: 2.13.0-M4
+      env: SCALAJS_VERSION=1.0.0-M3
 
 cache:
   directories:

build.sbt

@@ -1,6 +1,6 @@
 import sbtcrossproject.crossProject
 
-crossScalaVersions in ThisBuild := Seq("2.12.5", "2.11.12", "2.10.7", "2.13.0-M3")
+crossScalaVersions in ThisBuild := Seq("2.12.5", "2.11.12", "2.10.7", "2.13.0-M3", "2.13.0-M4")
 scalaVersion in ThisBuild := (crossScalaVersions in ThisBuild).value.head
 
 val commonSettings: Seq[Setting[_]] = Seq(

src/main/scala/java/time/LocalDate.scala

@@ -379,7 +379,7 @@ object LocalDate {
 
   private final val iso = IsoChronology.INSTANCE
 
-  private val daysBeforeYears = Stream.iterate(1970 -> 0) { case (year, day) =>
+  private val daysBeforeYears = Iterator.iterate(1970 -> 0) { case (year, day) =>
     if (iso.isLeapYear(year)) (year + 1) -> (day + 366)
     else (year + 1) -> (day + 365)
   }.take(400).toVector