Update README.md
Update README.md
Merge branch 'devel'
Merge branch 'devel'
Merge branch 'devel'
Merge branch 'devel'
Merge branch 'devel'
Merge branch 'devel'
Merge branch 'devel'
Merge branch 'devel'
Merge branch 'devel'
Merge branch 'devel'
Merge branch 'devel'
Merge branch 'devel'
Merge branch 'devel'
Merge branch 'devel'
Merge branch 'devel'
avoid error when using module for the first time without having used battleschool before
When battle hasn't been executed the file battleschool_extra_vars.json does not exist. Therefore it is necessary to check the existence of this file first.
Merge pull request #7 from vascoosx/develop

avoid error when using module for the first time
Minor typo fixes to README