MNEMONIC-536: Fix Travis CI issue
MNEMONIC-536: Fix Travis CI issue

Signed-off-by: Gary <aa55abf0fec9e53eca8d3607057fa4e611f5eaf0@apache.org>

yzz127/incubator-mnemonic,yzz127/incubator-mnemonic,yzz127/incubator-mnemonic,yzz127/incubator-mnemonic