docs: add CHANGELOG.md

CHANGELOG.md

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+# CHANGELOG
+
+## v1.8.0
+
+-   add `resp.ok` - same as WHATWG fetch `resp.ok = (resp.statusCode >= 200 && resp.statusCode < 300)`
+-   add `resp.stream.body()` to populate `resp.body` rather than (or perhaps in addition to) continuing to stream (useful for error handling)