Update links for pub.dev

[nohli]

:sparkles: What kind of change does this PR introduce? (Bug fix, feature, docs update...)

With this PR, the right section on pub.dev will show the View/report issues link to GitHub again, like here (the show-logic was recently changed).

:arrow_heading_down: What is the current behavior?

It shows a Homepage link

:new: What is the new behavior (if this is a feature change)?

It shows links to Repository (GitHub) and View/report issues

:boom: Does this PR introduce a breaking change?

No.

:bug: Recommendations for testing

:memo: Links to relevant issues/docs

:thinking: Checklist before submitting

• [ ] I made sure all projects build.
• [x] I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy.
• [x] I updated CHANGELOG.md to add a description of the change.
• [x] I followed the style guide lines (code style guide).
• [x] I updated the relevant documentation.
• [x] I rebased onto current master.

[codecov[bot]]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage :thumbsup:

Coverage data is based on head (82e415b) compared to base (1947ff4). Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #908   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           16        16           
=========================================
  Hits            16        16           

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