Add typo of perturbations

codespell_lib/data/dictionary.txt

diff --git a/codespell_lib/data/dictionary.txt b/codespell_lib/data/dictionary.txt
index 5eedc5c..4e20c6c 100644
--- a/codespell_lib/data/dictionary.txt
+++ b/codespell_lib/data/dictionary.txt
@@ -19835,6 +19835,7 @@
 persumably->presumably
 pertrub->perturb
 pertrubation->perturbation
+pertrubations->perturbations
 pertrubing->perturbing
 pertubate->perturb
 pertubated->perturbed