Ocean "country" queries not working

[cristinamullin]

Describe the bug

I noticed the WQP ocean country queries are not working. Using USGS dataRetrieval in R I received a more helpful error message than when I queried the WQP service directly. The error message that DR reports is that the codes must be in the format [A-Z]{2}, meaning two capital letters. It seems like all the ocean codes won’t work because they include numbers: https://www.waterqualitydata.us/Codes/countrycode

To Reproduce

Code to reproduce the behavior:

library(dataRetrieval)
test = readWQPdata(countrycode = "3M", dataProfile = "resultPhysChem", ignore_attributes = TRUE, startDate = "2013-01-01")

library(TADA)
test = TADA_DataRetrieval(countrycode = "3M", startDate = "2013-01-01")

[1] "Downloading WQP query results. This may take some time depending upon the query size."
Request failed [400]. Retrying in 1 seconds...
Request failed [400]. Retrying in 1.6 seconds...
Bad Request (HTTP 400).299 WQP "The value of countrycode=3M must match the format [A-Z]{2}"
Error in attr(retval, "queryTime") <- Sys.time() : 
  attempt to set an attribute on NULL

Expected behavior

We should be able to query the WQP for ocean data using the country codes.