Mention fix of performance regression

r-lib · Nov 18, 2019 · daf4450 · daf4450
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 # testthat (development version)
 
+* The last version of testthat introduced a performance regression in
+  error assertions (#963). To fix it, you need to install rlang 0.4.2.
+
 * Fixed error assertions with rJava errors (#964).
 
 * Fixed issue where error and warning messages were not retrieved with