release to CRAN needed

[zkamvar]

CRAN has been breathing down my neck about epikit and apyramid. Both of these are at risk of being archived (and a big headache for me) if I don't upload them by Tuesday.

Here are some failing checks that were fixed by Hadley a few weeks ago:

Version: 0.1.2
Check: tests
Result: ERROR
     Running ‘testthat.R’ [4s/5s]
    Running the tests in ‘tests/testthat.R’ failed.
    Complete output:
     > library(testthat)
     > library(epikit)
     >
     > test_check("epikit")
     [ FAIL 1 | WARN 1 | SKIP 1 | PASS 111 ]
    
     ══ Skipped tests ═══════════════════════════════════════════════════════════════
     • On CRAN (1)
    
     ══ Failed tests ════════════════════════════════════════════════════════════════
     ── Error ('test-age-categories.R:179'): years alone give years ─────────────────
     Error in `forcats::fct_drop(res, droppings)`: `only` must be a character vector or `NULL`, not a logical vector.
     Backtrace:
     ▆
     1. └─epikit::group_age_categories(df, years = years, one_column = FALSE) at test-age-categories.R:179:2
     2. └─forcats::fct_drop(only = droppings)
     3. └─forcats:::check_character(only, allow_null = TRUE)
     4. └─forcats:::stop_input_type(...)
     5. └─rlang::abort(message, ..., call = call, arg = arg)
    
     [ FAIL 1 | WARN 1 | SKIP 1 | PASS 111 ]
     Error: Test failures
     Execution halted
Flavors: [r-devel-linux-x86_64-debian-clang](https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-debian-clang/epikit-00check.html), [r-patched-linux-x86_64](https://www.r-project.org/nosvn/R.check/r-patched-linux-x86_64/epikit-00check.html), [r-release-linux-x86_64](https://www.r-project.org/nosvn/R.check/r-release-linux-x86_64/epikit-00check.html)

The last set of checks that worked were from #31, so that's the version I am going to submit.

I am not going to submit the version as it is now with #32 because of two things:

1. it does not pass checks
2. it adds another non-CRAN dependency which will make submitting to CRAN even more hellish.

[aspina7]

mmmm surprised about noncran dependency? Ah fuck because I moved props to epitabulate and that's not submitted....
Right then stick to your plan