Change: fix cmds async execution

[isirode]

Hello,

I've noticed that the execution order of the sub commands was not working correctly for my use case.

• The command was returning even though I had put an await in the 'exe' of the sub command

After taking a look at the code, I figure that it was caused by the fact the 'res.cmd.exe(res)' code line is not awaited.

Changes:

• Correction of the res.cmd.exe code line
• Adding tests so that the execution order is tested (tests are not passing without the fix)
• Incrementation of the version according to SemVer
• Modification of the package-lock.json : that must had happen in the npm install, not intentionnal

I've noticed that you have a branch 'feature/v2', which look like a full rework.

Are you still working on it ?

I've noticed a few bugs in your documentation, I will wait for the answer to this PR before pushing the fixes,in another PR.

Thanks in advance,