[10.0][MIG] attachment_preview migration

[tarteo]

Backport of #194

[yung-wang]

Tested and i can see the preview. OK

[OCA-git-bot]

This PR has the approved label and has been created more than 5 days ago. It should therefore be ready to merge by a maintainer (or a PSC member if the concerned addon has no declared maintainer). 🤖

[astirpe]

Tested in Runbot: OK. Code review: OK.

[tarteo]

Can this be merged, please 😁

[rafaelbn]

/ocabot merge

[OCA-git-bot]

Sorry @rafaelbn you are not allowed to merge.

To do so you must either have push permissions on the repository, or be a declared maintainer of all modified addons.

If you wish to adopt an addon and become it's maintainer, open a pull request to add your GitHub login to the maintainers key of its manifest.

[pedrobaeza]

/ocabot merge

[OCA-git-bot]

Hey, thanks for contributing! Proceeding to merge this for you.
Prepared branch 10.0-ocabot-merge-pr-199-by-pedrobaeza-bump-no, awaiting test results.

[OCA-git-bot]

@pedrobaeza your merge command was aborted due to failed check(s), which you can inspect on this commit of 10.0-ocabot-merge-pr-199-by-pedrobaeza-bump-no.

After fixing the problem, you can re-issue a merge command. Please refrain from merging manually as it will most probably make the target branch red.

[pedrobaeza]

Please rebase and fix the conflict as I needed to fix Travis CI

[tarteo]

@pedrobaeza Done

[pedrobaeza]

/ocabot merge

[OCA-git-bot]

On my way to merge this fine PR!
Prepared branch 10.0-ocabot-merge-pr-199-by-pedrobaeza-bump-no, awaiting test results.

[OCA-git-bot]

@pedrobaeza The merge process could not be finalized, because command git rebase 10.0 failed with output:

First, rewinding head to replay your work on top of it...
Applying: [MIG] attachment_preview to version 10.0
Using index info to reconstruct a base tree...
M	.travis.yml
Falling back to patching base and 3-way merge...
Removing attachment_preview/view/attachment_preview.xml
Removing attachment_preview/static/src/css/attachment_preview.css
Removing attachment_preview/model/ir_attachment.py
Removing attachment_preview/model/__init__.py
Auto-merging .travis.yml
CONFLICT (content): Merge conflict in .travis.yml
Patch failed at 0001 [MIG] attachment_preview to version 10.0
Use 'git am --show-current-patch' to see the failed patch

Resolve all conflicts manually, mark them as resolved with
"git add/rm <conflicted_files>", then run "git rebase --continue".
You can instead skip this commit: run "git rebase --skip".
To abort and get back to the state before "git rebase", run "git rebase --abort".

[pedrobaeza]

@tarteo please never use GitHub conflict resolution, as it totally messes the commit history. Thanks to bot we have discovered the problem before the merge!

[tarteo]

@pedrobaeza I created a new PR with the rebase #224