change 2singleton pattern #6

Merged n-kande merged 2 commits into nitta-lab-2019:master from nitta-lab-2019:CreateUsersModel on 24 May 2019
2019-05-23
@t-kisimoto
add method getInstance
t-kisimoto committed on 23 May 2019 1 error checks
@t-kisimoto
change 2singleton pattern
t-kisimoto committed on 23 May 2019