Removed unnecessary import of IkaConfig.
Removed unnecessary import of IkaConfig.

* It caused a CI error (https://travis-ci.org/hasegaw/IkaLog/builds/126817984)

hasegaw/IkaLog,hasegaw/IkaLog,hasegaw/IkaLog,deathmetalland/IkaLog,deathmetalland/IkaLog,deathmetalland/IkaLog