Update README.md (#370)

Remove the vandalism to the repository and README.md
diff --git a/README.md b/README.md
index ab68973..18ff78d 100644
--- a/README.md
+++ b/README.md
@@ -3,11 +3,6 @@
 [![package publisher](https://img.shields.io/pub/publisher/vector_math.svg)](https://pub.dev/packages/vector_math/publisher)
 [![Coverage Status](https://coveralls.io/repos/google/vector_math.dart/badge.svg?branch=master)](https://coveralls.io/r/google/vector_math.dart?branch=master)
 
-# Moved
-
-The source for this package has moved to [flutter/core-packages](https://github.com/flutter/core-packages),
-and issues should now be filed in [flutter/flutter](https://github.com/flutter/flutter).
-
 ## Introduction
 
 A Vector math library for 2D and 3D applications.