Adding Changelog entry for patch release

Author: gnunicorn

docs/CHANGELOG.md

@@ -6,6 +6,18 @@ The format is based on [Keep a Changelog].
 
 ## Unreleased
 
+## 2.0.0-> 2.0.1
+
+Patch release with backports to fix broken nightly builds.
+Namely contains backports of
+
+* [#7381: Make Substrate compile with latest nightly](https://github.com/paritytech/substrate/pull/7381)
+* [#7238: Fix compilation with environmental on latest nightly](https://github.com/paritytech/substrate/pull/7238)
+* [#7395: Make benchmarks compile with latest nightly](https://github.com/paritytech/substrate/pull/7395)
+* [#7838: Fix incorrect use of syn::exports](https://github.com/paritytech/substrate/pull/7838) (partially)
+* [#7854: Update to futures 0.3.9](https://github.com/paritytech/substrate/pull/7854)
+
+
 ## 2.0.0-rc6 -> 2.0.0 – two dot 😮
 
 Runtime