Revert "Bump github.com/spf13/viper from 1.4.0 to 1.10.1"
Revert "Bump github.com/spf13/viper from 1.4.0 to 1.10.1"

This reverts commit c3fe1654b992806da21caa6c3f64b65336d87632.

chrislusf/seaweedfs,chrislusf/seaweedfs,chrislusf/seaweedfs,chrislusf/seaweedfs