Add publication year to README

README.md

@@ -1,8 +1,8 @@
 # p_discolor_auditory_feedback
 
 Acoustic parameters of P. discolor vocalisations, auditory brainstem
-responses, and data analysis programs for Lattenkamp et al., “The vocal
-development of the pale spear-nosed bat is dependent on auditory
+responses, and data analysis programs for Lattenkamp et al., 2021, “The
+vocal development of the pale spear-nosed bat is dependent on auditory
 feedback”.
 
 ## Vocalisations