Manifest v2 and upgrade to v6.1.0

[Tagadda]

Problem

• Fix #27

Solution

• manifest v2

PR Status

• [x] Code finished and ready to be reviewed/tested
• [x] The fix/enhancement were manually tested (if applicable)

Automatic tests

Automatic tests can be triggered on https://ci-apps-dev.yunohost.org/ after creating the PR, by commenting "!testme", "!gogogadgetoci" or "By the power of systemd, I invoke The Great App CI to test this Pull Request!". (N.B. : for this to work you need to be a member of the Yunohost-Apps organization)

[Tagadda]

!testme

[yunohost-bot]

:sunflower:

[Tagadda]

!testme

[yunohost-bot]

:sunflower:

[Tagadda]

!bookwormtestme

[yunohost-bot]

:books:

[orhtej2]

!bookwormtestme

[yunohost-bot]

Living in the future, are we?

[Tagadda]

!bookwormtestme

[orhtej2]

!bookwormtestme

[yunohost-bot]

:books: :worm:

[orhtej2]

!bookwormtestme

[yunohost-bot]

Living in the future, are we?

[Tagadda]

!testme

[yunohost-bot]

:v:

[Tagadda]

Let's merge ?