fix: broken hyperlinks in PR template (#686)

Signed-off-by: Pierre-Yves Lapersonne <pierreyves.lapersonne@orange.com>

Author: pylapp

.github/pull_request_template.md

@@ -35,7 +35,7 @@ _Note: Please transform `- [ ]` into `- (NA)` in the description when things are
 
 #### Contribution
 
-- [ ] I have read the [contributing guidelines](https://github.com/Orange-OpenSource/ouds-flutter/blob/develop/CONTRIBUTING.md)
+- [ ] I have read the [contributing guidelines](https://github.com/Orange-OpenSource/ouds-flutter/blob/develop/.github/CONTRIBUTING.md)
 
 #### Accessibility
 
@@ -47,7 +47,7 @@ _Note: Please transform `- [ ]` into `- (NA)` in the description when things are
 
 #### Development
 
-- [ ] My change follows the [developer guide](https://github.com/Orange-OpenSource/ouds-flutter/blob/develop/DEVELOP.md)
+- [ ] My change follows the [developer guide](https://github.com/Orange-OpenSource/ouds-flutter/blob/develop/.github/DEVELOP.md)
 - [ ] I have added unit tests to cover my changes _(optional)_
 
 #### Documentation
@@ -61,4 +61,4 @@ _Note: Please transform `- [ ]` into `- (NA)` in the description when things are
 - [ ] Design review
 - [ ] A11y review
 - [ ] Internal files have been updated if relevant (THIRD_PARTY, NOTICE)
-- [ ] changelog.md has been updated respecting [keep a changelog rules](https://keepachangelog.com/en/1.0.0/) and referencing the issue
+- [ ] CHANGELOG.md files have been updated respecting [keep a changelog rules](https://keepachangelog.com/en/1.0.0/) and referencing the issue