Call 'addSchemaValueCompletions' method to collect completion items from scheme
Call 'addSchemaValueCompletions' method to collect completion items from scheme

Signed-off-by: Yevhen Vydolob <9165b7c4aff3707e6b45a5187bdc8160a45788f9@redhat.com>

redhat-developer/yaml-language-server,redhat-developer/yaml-language-server