It's unsafe to rely on "mojo@dev" branch

[jkewang]

After a recent update in the mojo dev branch a few days ago, some parts of the code started to produce errors.
Although temporarily changing the setup from 'git+https://git@github.com/stepjam/mojo.git@dev' to 'git+https://git@github.com/stepjam/mojo.git@main' can avoid this issue, future changes to the master might introduce new problems. It would be good to lock a specific tag to ensure code stability.

[chernyadev]

Hi, we are working on fixing this problem, will be closed in #19.

[chernyadev]

Closed with #19.