Update README.md

Co-authored-by: Bartlomiej Obecny <[email protected]>
open-telemetry · Mar 2, 2021 · 356e5e2 · 356e5e2
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@@ -249,7 +249,7 @@ To request automatic tracing support for a module not on this list, please [file
 
 [PR-1975](https://github.com/open-telemetry/opentelemetry-js/pull/1975)
 
-- Breaking change - Update resource key collision precedence
+- Breaking change - The resulting resource MUST have all attributes that are on any of the two input resources. If a key exists on both the old and updating resource, the value of the updating resource MUST be picked - previously it was opposite.
 
 ### 0.16.0 to 0.17.0