In composer.json I entered "nex/yii2-datepicker" : "*" in require section and minimum stability is stable. Now I run composer update, then foll error is displayed
Loading composer repositories with package information
Updating dependencies (including require-dev)
packagist.org could not be fully loaded, package information was loaded from the local cache and may be out of date
Your requirements could not be resolved to an installable set of packages.
- The requested package nex/yii2-datepicker * is satisfiable by nex/yii2-datepicker[dev-master] but these conflict with your requirements or minimum-stability