okc data now in modeldata

[topepo]

Not in recipes anymore:

   Running examples in ‘embed-Ex.R’ failed
   The error most likely occurred in:
   
   > ### Name: step_embed
   > ### Title: Encoding Factors into Multiple Columns
   > ### Aliases: step_embed tidy.step_embed embed_control
   > ### Keywords: datagen
   > 
   > ### ** Examples
   > 
   > data(okc)
   Warning in data(okc) : data set ‘okc’ not found
   > 
   > rec <- recipe(Class ~ age + location, data = okc) %>%
   +   step_embed(location, outcome = vars(Class),
   +              options = embed_control(epochs = 10))
   Error in is_tibble(data) : object 'okc' not found
   Calls: %>% ... eval -> recipe -> recipe.formula -> form2args -> is_tibble
   Execution halted
   ```

*   checking tests ...
   ```
    ERROR
   Running the tests in ‘tests/testthat.R’ failed.
   Last 13 lines of output:
     
     > 
     > test_check(package = "embed")
     ── 1. Error: (unknown) (@test_woe.R#9)  ────────────────────────────────────────
     object 'credit_data' not found
     Backtrace:
      1. base::sample(1:nrow(credit_data), 2000)
      2. base::nrow(credit_data)
     
     ══ testthat results  ═══════════════════════════════════════════════════════════
     [ OK: 112 | SKIPPED: 10 | WARNINGS: 1 | FAILED: 1 ]
     1. Error: (unknown) (@test_woe.R#9) 
     
     Error: testthat unit tests failed
     Execution halted
   ```

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