Update README.md

README.md

@@ -10,7 +10,7 @@ NOTE:
 - /diag/ needs a trailing '/'
 - /country/{xx} does not accept a trailing '/'
 - /country/{xx}{?limit} does accept a trailing '/'
-- /species/code does not accept a trailing '/'
+- /species/{speciesKey} does not accept a trailing '/'
 - Heroku stops the application after a certain time, so uptime is often '0' - '3' when you are the first request in a while
 
 Assumptions/Interpretation of task (where specifications were scarce):