chore: add a pair of releases to CHANGELOG.md (#625)

up to 0.11.0

CHANGELOG.md

@@ -1,8 +1,22 @@
+## 0.11.0
+
+* Added `Option.equal` function (thanks to ByronBecker) (#615).
+
+* Invoking `setTimer`, `ExperimentalCycles.add`, etc. now requires `system` capability (#622)
+
+* Added `bitshiftLeft`/`bitshiftRight` to `Nat` (#613).
+  This was added as part of #622 by mistake.
+
+## 0.10.4
+
+(nothing)
+
 ## 0.10.3
+
 * Added `ExperimentalInternetComputer.performanceCounter` function to get the raw performance counters (#600).
 
 * Added `Array.take` function to get some prefix of an array (#587).
 
 * Deprecated `TrieSet.mem` in favor of `TrieSet.contains` (#576).
 
-* bugfix: `Array.chain(as, f)` was incorrectly trapping when `f(a)` was an empty array (#599).
+* bugfix: `Array.chain(as, f)` was incorrectly trapping when `f(a)` was an empty array (#599).