Remove changelog from the readme

The project is hosted on github. There is a UI for releases where we
link to closed issues from each release.

README.md

@@ -12,31 +12,3 @@ ROME is a Java framework for RSS and Atom feeds. The framework consist of severa
 | `rome-opml` | [OPML](https://en.wikipedia.org/wiki/OPML) parsers and tools. |
 
 Deprecated modules: `rome-fetcher`, `rome-certiorem`, `rome-certiorem-webapp` and `rome-propono`.
-
-## Changelog
-
-### 1.6.0
-
-- [Upgrade of JDOM to version 2.0.5](https://github.com/rometools/rome/issues/197)
-- [Maven plugin and dependency updates](https://github.com/rometools/rome/issues/268)
-- [Support for allowing Doctype declarations in rome-fetcher](https://github.com/rometools/rome/issues/234)
-- [OSGi improvements](https://github.com/rometools/rome/issues/143) 
-
-### 1.5.1
-
-- solved an [XML bomb](https://en.wikipedia.org/wiki/Billion_laughs) vulnerability
-
-Important note: due to the security fix ROME now forbids all Doctype declarations by default. This will break compatibility with RSS 0.91 Netscape
-because it requires a Doctype declaration. When you experience problems you have to activate the property **allowDoctypes** on the SyndFeedInput object. You 
-should only use this possibility when the feeds that you process are absolutely trustful.
-
-### 1.5.0
-
-- many (untracked) enhancements
-- code cleanup
-- renamed packages (was required to be able to push to Maven Central after years again)
-- updated sourcecode to Java 1.6
-
-### Prior to 1.5.0
-
-- see [http://rometools.github.io/rome/ROMEReleases](http://rometools.github.io/rome/ROMEReleases)