Remove a reference to generics.

We don't show the generics version, so let's not confuse our developers. :)
pubspec name should use underscore rather than dash according to Dart Editor
Merge pull request #35 from chalin/patch-1

pubspec name should use underscore rather than dash according to Dart Editor
Fixing path to file in Chapter 4 doc.

Removing path prefix `web/3a-buttonbadge/`.
Merge pull request #36 from chalin/patch-2-doc-update

Fixing path to file in Chapter 4 doc.
fix "badges" vs. "bagdes"
Merge pull request #34 from sethladd/patch-6

Remove a reference to generics.