Remove duplicate changelog line [skip ci]

framework/CHANGELOG.md

@@ -255,7 +255,6 @@ Yii Framework 2 Change Log
 - Enh: `yii\helpers\UnsetArrayValue`, `yii\helpers\ReplaceArrayValue` object now can be restored after serialization using `var_export()` function (silvefire)
 - Chg #16192: `yii\db\Command::logQuery()` is now protected, extracted `getCacheKey()` from `queryInternal()` (drlibra)
 - Chg #16941: Set `yii\console\controllers\MigrateController::useTablePrefix` to true as default value (GHopperMSK)
-- Bug #16687: Add missing translations for `nl-NL` durations used in `yii\i18n\Formatter::asDuration()` (alexeevdv)
 
 
 2.0.15.1 March 21, 2018