Updated README

Fixed spelling mistake

README.md

@@ -61,8 +61,8 @@ Subsetting data using MOTU server
 </h3>
 
 The code below assumes that you have registered your account details
-using `option(CopernicusMarine_uid = "my_user_name")` and
-`option(CopernicusMarine_pwd = "my_password")`. If you are comfortable
+using `options(CopernicusMarine_uid = "my_user_name")` and
+`options(CopernicusMarine_pwd = "my_password")`. If you are comfortable
 that it is secure enough, you can also store these options in your
 `.Rprofile` such that they will be loaded each session. Otherwise, you
 can also provide your account details as arguments to the functions.