Compile-time warning

```
Warning found:
in module Test.Unit.Main
at bower_components/purescript-test-unit/src/Test/Unit/Main.purs line 16, column 1 - line 16, column 99

The import of module Test.Unit contains the following unused references:

countSkippedTests

It could be replaced with:

import Test.Unit (TestList, TestSuite, collectResults, filterTests, keepErrors)
```