testing ...

[korovkin]

not to be merged, this is to deal with:
#24

 $ go test -v limiter_test.go
=== RUN   TestExample
=== RUN   TestExample/TestExample
--- PASS: TestExample (0.00s)
    --- PASS: TestExample/TestExample (0.00s)
=== RUN   TestLimit
=== RUN   TestLimit/TestLimit
--- PASS: TestLimit (0.00s)
    --- PASS: TestLimit/TestLimit (0.00s)
=== RUN   TestExecuteWithTicket
=== RUN   TestExecuteWithTicket/TestExecuteWithTicket
--- PASS: TestExecuteWithTicket (0.00s)
    --- PASS: TestExecuteWithTicket/TestExecuteWithTicket (0.00s)
=== RUN   TestConcurrentIO
=== RUN   TestConcurrentIO/TestConcurrentIO
--- PASS: TestConcurrentIO (0.51s)
    --- PASS: TestConcurrentIO/TestConcurrentIO (0.51s)
=== RUN   TestConcurrently
=== RUN   TestConcurrently/TestConcurrently
--- PASS: TestConcurrently (0.00s)
    --- PASS: TestConcurrently/TestConcurrently (0.00s)
=== RUN   TestEmpty
=== RUN   TestEmpty/TestEmpty
--- PASS: TestEmpty (0.00s)
    --- PASS: TestEmpty/TestEmpty (0.00s)
=== RUN   TestDuo
=== RUN   TestDuo/TestDuo
l1 is alive
l1 is alive
l2 is alive
l2 is alive
l1 is alive
l2 is alive
l2 is alive
l2 is alive
l1 is alive
l2 is alive
l2 is alive
l1 is alive
l2 is alive
l2 is alive
l2 is alive