Support Scala 3 (#95)

* Support Scala 3

* Set up JDK 11 in ci.yml

* Update README.md

Author: vmunier

.github/workflows/ci.yml

@@ -13,9 +13,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
+    - name: Set up JDK 11
       uses: actions/setup-java@v1
       with:
-        java-version: 1.8
+        java-version: 11
     # just make sure we can start sbt and publish locally without errors
     - run: sbt +publishLocal

README.md

@@ -11,7 +11,7 @@ standard scala string interpolation.
 
 Add the library to `build.sbt`:
 ```
-libraryDependencies += "com.vmunier" %% "scalajs-scripts" % "1.2.0"
+libraryDependencies += "com.vmunier" %% "scalajs-scripts" % "1.3.0"
 ```
 
 ## Integration with Twirl
@@ -108,4 +108,4 @@ The `raw` function in ScalaTags allows you to embed raw HTML in the tag and call
 
 ## Publish a new version of the library
 
-New versions are automatically published to Sonatype when creating a git tag, thanks to [sbt-ci-release](https://github.com/olafurpg/sbt-ci-release).
+New versions are automatically published to Sonatype when creating a git tag, thanks to [sbt-ci-release](https://github.com/olafurpg/sbt-ci-release).

build.sbt

@@ -14,15 +14,14 @@ inThisBuild(List(
 ))
 
 name := "scalajs-scripts"
-scalaVersion := "2.13.12"
-crossScalaVersions := Seq("2.12.18", scalaVersion.value)
+scalaVersion := "3.3.1"
+crossScalaVersions := Seq("2.13.12", scalaVersion.value)
 
 enablePlugins(SbtTwirl)
 
-scalacOptions ++= Seq(
-  "-encoding", "utf8",
-  "-deprecation", "-feature", "-unchecked", "-Xlint",
-  "-Ywarn-dead-code",
-  "-Ywarn-numeric-widen",
-  "-Ywarn-value-discard"
-)
+scalacOptions ++= Seq("-encoding", "utf8", "-deprecation", "-feature", "-unchecked")
+
+libraryDependencies ++= (CrossVersion.partialVersion(scalaVersion.value) match {
+  case Some((3, _)) => Seq()
+  case _            => Seq("org.scala-lang" % "scala-reflect" % scalaVersion.value % "provided")
+})

project/build.properties

@@ -1 +1 @@
-sbt.version=1.9.6
+sbt.version=1.9.7

project/plugins.sbt

@@ -1,4 +1,4 @@
 resolvers += "Typesafe repository" at "https://repo.typesafe.com/typesafe/releases/"
 
-addSbtPlugin("com.typesafe.play" % "sbt-twirl" % "1.6.1")
+addSbtPlugin("org.playframework.twirl" % "sbt-twirl" % "2.0.1")
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.12")