Consolidate changes by affected packages

[gigabo]

The outer list displays packages affected by a given change. This may have multiple entries for the same package or set of packages, which could be consolidated.

For example, here, the outer list could have only two entries instead of four:

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Enhancement

• generator-react-server
  • #229 Generate meta tags. (@doug-wade)
• generator-react-server
  • #231 Add .reactserverrc to generator. (@doug-wade)
• react-server-test-pages, react-server
  • #221 Add new component: <TheFold />. (@gigabo)
• react-server-test-pages, react-server
  • #224 Expose new convenience function: navigateTo. (@gigabo)