Fix #110: setReadableEncoding should be readableEncoding

app/current/src/main/scala/io/scalajs/nodejs/stream/Stream.scala

@@ -163,8 +163,13 @@ sealed trait IReadable extends LegacyStream {
   def readable: Boolean = js.native
 
   @enableIf(io.scalajs.nodejs.internal.CompilerSwitches.gteNodeJs12)
+  @deprecated("Wrong name. Use readableEncoding", "0.9.1")
+  @JSName("readableEncoding")
   def setReadableEncoding: String = js.native
 
+  @enableIf(io.scalajs.nodejs.internal.CompilerSwitches.gteNodeJs12)
+  def readableEncoding: String = js.native
+
   @enableIf(io.scalajs.nodejs.internal.CompilerSwitches.gteNodeJs12)
   def readableEnded: Boolean = js.native
 

app/current/src/test/scala/io/scalajs/nodejs/stream/ReadableTest.scala

@@ -0,0 +1,12 @@
+package io.scalajs.nodejs.stream
+
+import io.scalajs.nodejs.fs.ReadStream
+import org.scalatest.funspec.AnyFunSpec
+
+class ReadableTest extends AnyFunSpec {
+  describe("Readable") {
+    it("readableEncoding") {
+      assert(new ReadStream("package.json").readableEncoding === null)
+    }
+  }
+}