A potential typo in file Dockerfile

[wangluochao902]

doc2audiobook/Dockerfile

Line 10 in 700714b

&& apt-get update -oAcquire::AllowInsecureRepositories=true \

Hi, we are developing a tool to detect typos/bugs in dockerfiles automatically. Our tool finds a potential typo above. Is it a typo? I think it should be
apt-get update -o=Acquire::AllowInsecureRepositories=true
or
apt-get update -o Acquire::AllowInsecureRepositories=true
Thank you for your confirmation.