v2.2.1

docs/release-notes.md

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+# 2.2.1
+
+## Fixes
+* Fixed compilation error when compiling Catch2 with `std=c++17` against libc++ (#1214)
+  * Clara (Catch2's CLI parsing library) used `std::optional` without including it explicitly
+* Fixed Catch2 return code always being 0 (#1215)
+  * In the words of STL, "We feel superbad about letting this in"
+
+
 # 2.2.0
 
 ## Fixes