add README.md to explain changelog

KengoTODA · KengoTODA · commit 09347c1a1cf5 · 2013-12-31T15:03:07.000+08:00
diff --git a/README.md b/README.md
@@ -0,0 +1,9 @@
+A fork of [java-diff-utils](https://code.google.com/p/java-diff-utils/)
+
+# Changelog
+
+## 1.4.0
+
+- switch from JDK5 to JDK7
+- add Guava to dependency
+- let user uses other string to represent line which does not exist
