Issue with new smoof version

[jakobbossek]

Hi,

I had to fix some warnings in the smoof package recently which were raised in the r-devel versions. In this context, I moved the mco package from Imports to Suggests. Reverse dependency checks on CRAN now throw the following error.
Can you please take care in your package and import mco?

Best wishes,
Jakob

══ Failed tests ════════════════════════════════════════════════════════════════
   ── Error ('test_objective.R:172'): makeBaselineObjective ───────────────────────
   Error in `requirePackages(c("mco", "emoa"), why = "multi-objective optimization")`: For multi-objective optimization please install the following packages: mco
   Backtrace:
        ▆
     1. ├─... %>% setMBOControlTermination(iters = 1) at test_objective.R:172:2
     2. ├─mlrMBO::setMBOControlTermination(., iters = 1)
     3. │ └─checkmate::assertClass(control, "MBOControl")
     4. │   └─checkmate::checkClass(x, classes, ordered, null.ok)
     5. ├─mlrMBO::setMBOControlInfill(., makeMBOInfillCritDIB())
     6. │ └─checkmate::assertClass(control, "MBOControl")
     7. │   └─checkmate::checkClass(x, classes, ordered, null.ok)
     8. └─mlrMBO::makeMBOControl(n.objectives = 2)
     9.   └─mlrMBO::setMBOControlMultiObj(control)
    10.     └─BBmisc::requirePackages(c("mco", "emoa"), why = "multi-objective optimization")
    11.       └─BBmisc::stopf(...)