Improve documentation

2020-07-12 15:47:42.234465: The command is executing, please wait...
Unhandled exception:
type 'String' is not a subtype of type 'List<dynamic>'
#0      main (file:///C:/flutter/.pub-cache/hosted/pub.dartlang.org/split_icon-0.3.1+1/bin/main.dart:44:5)
#1      main (file:///C:/flutter/.pub-cache/hosted/pub.dartlang.org/split_icon-0.3.1+1/bin/split_icon.dart:3:3)
#2      _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:299:32)
#3      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)
pub finished with exit code 255

Getting this error whenever I try to run the command.

EDIT: Issue was a missing space when defining the packs used.

flutter_icons:
  includes:
    - ant 
    - fea

Is how it should be.

Not

flutter_icons:
  includes:
    -ant 
    -fea

Which is what is shown in the documentation.