fix #10 set

+collection functions (map, forEach, toList, toSet, isEmpty, etc,)

lynglib/src/jvmTest/kotlin/BookTest.kt

@@ -255,6 +255,11 @@ class BookTest {
         runDocTests("../docs/Range.md")
     }
 
+    @Test
+    fun testSet() = runTest {
+        runDocTests("../docs/Set.md")
+    }
+
     @Test
     fun testSampleBooks() = runTest {
         for (bt in Files.list(Paths.get("../docs/samples")).toList()) {