Add changeset

.changeset/funny-flies-accept.md

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+---
+"@siteimprove/alfa-compatibility": patch
+"@siteimprove/alfa-css-feature": patch
+"@siteimprove/alfa-performance": patch
+"@siteimprove/alfa-trampoline": patch
+"@siteimprove/alfa-rectangle": patch
+"@siteimprove/alfa-selective": patch
+"@siteimprove/alfa-toolchain": patch
+"@siteimprove/alfa-branched": patch
+"@siteimprove/alfa-selector": patch
+"@siteimprove/alfa-sequence": patch
+"@siteimprove/alfa-cascade": patch
+"@siteimprove/alfa-emitter": patch
+"@siteimprove/alfa-network": patch
+"@siteimprove/alfa-affine": patch
+"@siteimprove/alfa-device": patch
+"@siteimprove/alfa-either": patch
+"@siteimprove/alfa-future": patch
+"@siteimprove/alfa-option": patch
+"@siteimprove/alfa-record": patch
+"@siteimprove/alfa-result": patch
+"@siteimprove/alfa-cache": patch
+"@siteimprove/alfa-graph": patch
+"@siteimprove/alfa-rules": patch
+"@siteimprove/alfa-slice": patch
+"@siteimprove/alfa-style": patch
+"@siteimprove/alfa-table": patch
+"@siteimprove/alfa-xpath": patch
+"@siteimprove/alfa-aria": patch
+"@siteimprove/alfa-http": patch
+"@siteimprove/alfa-iana": patch
+"@siteimprove/alfa-lazy": patch
+"@siteimprove/alfa-list": patch
+"@siteimprove/alfa-time": patch
+"@siteimprove/alfa-wcag": patch
+"@siteimprove/alfa-act": patch
+"@siteimprove/alfa-css": patch
+"@siteimprove/alfa-dom": patch
+"@siteimprove/alfa-fnv": patch
+"@siteimprove/alfa-map": patch
+"@siteimprove/alfa-set": patch
+"@siteimprove/alfa-url": patch
+"@siteimprove/alfa-web": patch
+---
+
+**Changed:** Classes that do not implement the Singleton pattern now have `protected` constructor and can be extended.