drop Scala 2.11 support for 4.x (#493)

Co-authored-by: 梦境迷离 <[email protected]>

Author: SethTisue

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         java: [ 11, 17, 21 ]
-        scala: [ 2.11.x, 2.12.x, 2.13.x, 3.x ]
+        scala: [ 2.12.x, 2.13.x, 3.x ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3

README.md

@@ -22,7 +22,7 @@ if (logger.isDebugEnabled) logger.debug(s"Some $expensive message!")
 
 * Java 11 or higher
   * Scala Logging 3.x supports Java 8
-* Scala 2.11, 2.12, 2.13 or 3.0
+* Scala 2.12, 2.13 or 3.0
 * Logging backend compatible with SLF4J
 
 A compatible logging backend is [Logback](http://logback.qos.ch), add it to your sbt build definition:

build.sbt

@@ -6,7 +6,7 @@ import sbt.url
 
 val scala213 = "2.13.16"
 val scala3 = "3.7.4"
-val scala2 = Seq("2.11.12", "2.12.20", scala213)
+val scala2 = Seq("2.12.20", scala213)
 val isScala3 = Def.setting {
   CrossVersion.partialVersion(scalaVersion.value).exists(_._1 != 2)
 }