HTTP 404 not found

If you run the example in the Vignettes.
```
library(bcgroundwater)
well <- "45" # Observation Well Number
data <- get_gwl(wells = well)
> Error in FUN(X[[i]], ...) : Not Found (HTTP 404).
```

The failure is reproduced by the Vignettes example using get_gwl(wells = well) with well "45". Start by running that example and tracing the request made by get_gwl; done means the documented example retrieves data without the HTTP 404.

Written by the indexing model from the issue text.