Adding automations

.travis.yml

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+language: python
+
+before_install:
+  - git clone https://github.com/YunoHost/package_linter /tmp/package_linter
+
+script:
+- /tmp/package_linter/package_linter.py ./

pull_request_template.md

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+## Problem
+- *Description of why you made this PR*
+
+## Solution
+- *And how do you fix that problem*
+
+## PR Status
+- [ ] Code finished.
+- [ ] Tested with Package_check.
+- [ ] Fix or enhancement tested.
+- [ ] Upgrade from last version tested.
+- [ ] Can be reviewed and tested.
+
+## Validation
+---
+- [ ] **Code review**
+- [ ] **Approval (LGTM)**  
+*Code review and approval have to be from a member of @YunoHost/apps group*
+- **CI succeeded** : 
+[![Build Status](https://ci-apps-dev.yunohost.org/jenkins/job/mastodon_ynh%20-BRANCH-/badge/icon)](https://ci-apps-dev.yunohost.org/jenkins/job/mastodon_ynh%20-BRANCH-/)  
+*Please replace '-BRANCH-' in this link by the name of the branch used.*  
+*If the PR is from a forked repository. Please provide public results from package_check.*  
+When the PR is marked as ready to merge, you have to wait for 3 days before really merging it.