update readme and changelog for 2.0.0-M2 (#449)

Author: SethTisue

Diff for: CHANGELOG.md

@@ -1,14 +1,22 @@
 # Scala XML Changes
 
+## 2.0.0-M2 (2020-09-15)
+
+Published for Scala 2.12 and 2.13, Scala.js 1.2.0,
+and Dotty 0.27.0-RC1.
+
+### Removed
+
+- Removed `scala.xml.dtd.ElementValidator`
+
 ## 2.0.0-M1 (2019-10-21)
 
 Not binary compatible with Scala XML 1.2.0.
 
 Published for Scala 2.12, 2.13 and Scala.js 0.6, 1.0.0-M8.
 Artifacts are no longer published for Scala 2.11.
 
-There have been a number of deprecated elements that have been
-removed, see the "[Removed](#Removed)" section below.
+Some deprecated elements have been removed; see the "[Removed](#Removed)" section below.
 
 ### Added
 
@@ -57,5 +65,6 @@ the Scala compiler, not in the Scala XML library.
 - Remove `scala.xml.dtd.impl.PointedHedgeExp`
 - Remove `scala.xml.dtd.Scanner`
 - Remove `scala.xml.dtd.ContentModelParser`
+- Remove `scala.xml.dtd.ElementValidator`
 - Remove `scala.xml.factory.Binder`
 - Remove `scala.xml.parsing.ValidatingMarkupHandler`

Diff for: README.md

@@ -16,7 +16,7 @@ How to documentation is available in the [wiki](https://github.com/scala/scala-x
 
 The latest stable release of Scala XML is 1.3.0.
 
-Experimental milestone releases of Scala XML version 2.0 are available, starting with 2.0.0-M1.  See the changes for 2.0 in `CHANGELOG.md`.
+Experimental milestone releases of Scala XML version 2.0 are available. Since 2.0.0-M2, Dotty is supported. See the changes for 2.0 in `CHANGELOG.md`.
 
 ## Maintenance status