v0.22 prep change log (#1805)

* Additional PRs

* New release date

changelog.md

@@ -2,14 +2,23 @@
 ---
 # Ten Testnet Change Log
 
-# Feb 2024-02-16 (v0.22.0)
+# Feb 2024-02-20 (v0.22.0)
 * Validator nodes now return errors on transaction submission. Previously, transactions that would fail validation were
   accepted into the mempool of the validator without error (e.g. insufficient funds for a transfer, gas below the 
   intrinsic gas limit etc). This change will mean that invalid transactions are rejected immediately. 
 * The Gateway now performs caching on RPC requests. For a list of the cached requests see the design proposal in 
   go-ten/design/gateway/gateway_caching.md. Note that we expect the caching logic to change over time as we optimise
   the user experience. 
 * A full list of the PRs merged in this release is as below;
+    * `038f6a64` Cache fixes for e2e tests (#1803)
+    * `b70a894d` Update ten's visual identity (#1797)
+    * `1782b623` Update ten's visual identity (#1796)
+    * `ada2d2c1` Concurrency fix (#1802)
+    * `6eda211d` Chore(contracts): a bit of proofreading (#1754)
+    * `2ab4fc3e` Tweak cache params (#1801)
+    * `3a74586b` Change mempool validation function (#1800)
+    * `597cf0ec` Change log for the v0.22 release (#1799)
+    * `a2a080aa` Gateway caching proposal (#1773)
     * `5b5e7d98` Ten gateway caching (#1779)
     * `7792864a` Adjust port offset (#1798)
     * `1837bcc6` More flakiness fixes (#1795)