Remove mention of `mammut` as requested in #133

README.md

@@ -106,35 +106,3 @@ fn main() -> Result<(), Box<Error>> {
     Ok(())
 }
 ```
-
-## Relationship to [Mammut](https://github.com/Aaronepower/mammut)
-
-This library was forked from Mammut around elefren commit
-6c37ecb1e1ec3aa888711c1fad1a76f3bdf826b3.  I started this fork as a
-place to experiment with some of the changes I wanted to make to Mammut,
-and ended up diverging enough that I didn't really want to spend the time
-trying to get everything merged back.
-
-Some of the major differences between this and mammut are:
-
-* Compatibility with newer mastodon versions. Elefren supports new API
-  calls introduced in Mastodon 2.4 and 2.5, and 2.6 support is being
-  worked on.
-* Compatibility with other implementations of the Mastodon API. One
-  design goal of elefren is to be compatible with as many
-  implementations of the Mastodon API as possible. Currently, this means
-  the GlitchSoc fork of Mastodon, and Pleroma. I do not guarantee that
-  support is 100% there, but if you find any inconsistencies, it is a
-  bug and I hope you can take the time to open an issue here
-* Multiple bug fixes
-
-I have a couple big features on the horizon, the first being a
-comprehensive test suite that I'm currently working on, which should
-help us test for inconsistencies and issues between the different
-versions of the Mastodon API that elefren aims to support. After that, I
-will be trying to get support for the Mastodon Streaming API merged in,
-though that might need to wait until rust's async story is a little more
-stable.
-
-For a complete list of changes, see the
-[Changelog](https://github.com/pwoolcoc/elefren/blob/master/CHANGELOG.md).