Update CHANGELOG with London changes overview

Author: fselmo

CHANGELOG

@@ -1,18 +1,31 @@
-Unreleased
+v0.6.0-beta.1
 -------------
 
+Released 2021-11-03
+
+- Features
+
+  - London support (https://github.com/ethereum/eth-tester/pull/206)
+    - Upgrade py-evm to v0.5.0-alpha.1 for London support
+    - Default to London
+    - Support access list transactions and dynamic fee transactions
+    - Transaction param support for `access_list`, `type`, `max_fee_per_gas`, `max_priority_fee_per_gas`
+    - Transaction receipt param support for `type` and `effective_gas_price`
+    - Block param support for `base_fee_per_gas`
+
 - Misc
 
   - Adjust wording in README regarding genesis parameters
 
 v0.5.0-beta.4
 -------------
+
 Released 2021-04-12
 
 - Features
 
-	- Upgrade py-evm to v0.4.0-alpha.4 for Python 3.9 support
-		https://github.com/ethereum/eth-tester/pull/205
+  - Upgrade py-evm to v0.4.0-alpha.4 for Python 3.9 support
+	https://github.com/ethereum/eth-tester/pull/205
   - Upgrade py-evm to v0.4.0-alpha.3, for Berlin support
     Default to Berlin
     https://github.com/ethereum/eth-tester/pull/204