[-Encoding] is no longer needed
ignore inc:: plugins when installing
also mention the irc channel
airplane mode
Dist-Zilla-PluginBundle-Author-ETHER-0.042

          - drop use of [-Encoding] Pod::Weaver plugin - no longer needed with
            Pod::Weaver 4
          - update generated CONTRIBUTING file to filter out local plugins
            when running 'dzil authordeps --missing', and to mention the irc
            channel when available
          - new "airplane" mode, to faciliate development while the network is
            not available