package:lints v4.0.0

• core:
  • added library_annotations (#177)
  • added no_wildcard_variable_uses (#139)
  • removed package_prefixed_library_names (#172)
• recommended:
  • removed library_names (#181)
• Updated the SDK lower-bound to 3.1.
• Add a section on upgrading to the latest lint set to the readme.