Incompatible with latest core.async

[sunng87]

lein test :only rigui.async-test/test-delayed-chan

FAIL in (test-delayed-chan) (async_test.cljc:22)
base case
expected: (= port d-chan)
  actual: (not (= #object[clojure.core.async.impl.channels.ManyToManyChannel 0x1672c2a4 "clojure.core.async.impl.channels.ManyToManyChannel@1672c2a4"] #object[rigui.async.DelayedChannel 0x66ac57cf "rigui.async.DelayedChannel@66ac57cf"]))

lein test :only rigui.async-test/test-delayed-chan

FAIL in (test-delayed-chan) (async_test.cljc:23)
base case
expected: (= v :a)
  actual: (not (= nil :a))

Test cases failed with latest core.async 1.1.587

[sunng87]

The timeout precision was cut in recent version of core.async. If we add a little bit more tolerance in test it will be ok,