Force JVM 11 to not limit downstream

Author: MateuszKubuszok

README.md

@@ -5,15 +5,20 @@ and each markdown document into a test suite.
 
 ## Usage
 
+Create `test-snippets.scala` (use at least Java 11):
+
 ```scala
 //> using scala 3.3.3
+//> using dep temurin:1.11.0.23
 //> using dep "com.kubuszok::scala-cli-md-spec:0.0.1"
 import com.kubuszok.scalaclimdspec
 @main def testSnippets(args: String*): Unit = scalaclimdspec.testSnippets(args.toArray) { cfg =>
   new scalaclimdspec.Runner.Default(cfg) // or provide your own :)
 }
 ```
 
+then run it with Scala CLI:
+
 ```bash
 # run all tests
 scala-cli run test-snippets.scala -- "$PWD/docs"

project.scala

@@ -1,4 +1,5 @@
 //> using scala 3.3.3
+//> using jvm temurin:1.11.0.23
 //> using dep "com.monovore::decline:2.4.1"
 
 //> using publish.name "scala-cli-md-spec"