for Scala 3 users, require Scala 3.1+

as per scala/scala-lang#1387, there's no longer any need
to keep supporting Scala 3.0.x. it's fine to expect people
to upgrade to 3.1 or higher

Author: SethTisue

.github/workflows/ci.yml

@@ -11,12 +11,10 @@ jobs:
       fail-fast: false
       matrix:
         java: [8, 11, 17]
-        scala: [2.11.x, 2.12.x, 2.13.x, 3.0.x]
+        scala: [2.11.x, 2.12.x, 2.13.x, 3.x]
         platform: [jvm, js, native]
         mode: [normal]
         exclude:
-          - scala: 3.0.x
-            platform: native
           - java: 11
             platform: js
           - java: 11

build.sbt

@@ -30,8 +30,8 @@ lazy val root = project
     compat213JVM,
     compat213JS,
     compat213Native,
-    compat30JVM,
-    compat30JS,
+    compat31JVM,
+    compat31JS,
     compat31Native,
     scalafixData211,
     scalafixData212,
@@ -53,8 +53,7 @@ lazy val junit = libraryDependencies += "com.github.sbt" % "junit-interface" % "
 lazy val scala211 = "2.11.12"
 lazy val scala212 = "2.12.15"
 lazy val scala213 = "2.13.8"
-lazy val scala30  = "3.0.2"
-lazy val scala31  = "3.1.3"
+lazy val scala3   = "3.1.3"
 
 lazy val compat = new MultiScalaCrossProject(
   "compat",
@@ -158,8 +157,7 @@ lazy val compat = new MultiScalaCrossProject(
 val compat211 = compat(Seq(JSPlatform, JVMPlatform, NativePlatform), scala211)
 val compat212 = compat(Seq(JSPlatform, JVMPlatform, NativePlatform), scala212)
 val compat213 = compat(Seq(JSPlatform, JVMPlatform, NativePlatform), scala213)
-val compat30  = compat(Seq(JSPlatform, JVMPlatform), scala30)
-val compat31  = compat(Seq(JVMPlatform, NativePlatform), scala31)
+val compat31  = compat(Seq(JSPlatform, JVMPlatform, NativePlatform), scala3)
 
 lazy val compat211JVM    = compat211.jvm
 lazy val compat211JS     = compat211.js
@@ -170,8 +168,8 @@ lazy val compat212Native = compat212.native
 lazy val compat213JVM    = compat213.jvm
 lazy val compat213JS     = compat213.js
 lazy val compat213Native = compat213.native
-lazy val compat30JVM     = compat30.jvm
-lazy val compat30JS      = compat30.js
+lazy val compat31JVM     = compat31.jvm
+lazy val compat31JS      = compat31.js
 lazy val compat31Native  = compat31.native
 
 lazy val binaryCompatOld = project