add plugin authors [CI SKIP]

Author: liufengyun

AUTHORS.md

@@ -71,3 +71,7 @@ The majority of the dotty codebase is new code, with the exception of the compon
 > the [compiler bridge in sbt 0.13](https://github.com/sbt/sbt/tree/0.13/compile/interface/src/main/scala/xsbt),
 > but has been heavily adapted and refactored.
 > Original authors were Mark Harrah, Grzegorz Kossakowski, Martin Duhemm, Adriaan Moors and others.
+
+`dotty.tools.dotc.plugins`
+
+> Adapted from  [scala/scala](https://github.com/scala/scala) with some modifications. They were originally authored by Lex Spoon, Som Snytt, Adriaan Moors, Paul Phillips and others.

sbt-dotty/sbt-test/sbt-dotty/compiler-plugin/plugin/DivideZero.scala

@@ -27,7 +27,7 @@ class DivideZero extends PluginPhase with StandardPlugin {
     def test(tpe: String): Boolean =
       (sym.owner eq ctx.requiredClass(tpe.toTermName)) && sym.name.show == "/"
 
-    test("scala.Int") || test("scala.Long") || test("scala.Short") || test("scala.FLoat") || test("scala.Double")
+    test("scala.Int") || test("scala.Long") || test("scala.Short") || test("scala.Float") || test("scala.Double")
   }
 
   override def transformApply(tree: tpd.Apply)(implicit ctx: Context): tpd.Tree = tree match {