Typo fix

CHANGELOG.md

@@ -10,7 +10,7 @@ Where users have previously used `np.random.seed` they should now call
 `bilby.core.utils.random.seed`.
 
 ### Changes
-- Fix issues releated to random number generation with multiprocessing (!1273)
+- Fix issues related to random number generation with multiprocessing (!1273)
 - Enable cosmological priors to be written/read in our plain text format (!1258)
 - Allow posterior reweighting to be performed when changing the likelihood and the prior (!1260)