Fix conflict section in composer.json

2.0.0 is not installable...

Compatible with Robo 0.5

Please see CHANGELOG.md for additional information.
Do not use this with Robo 0.4. Use 1.0.3 instead.

Same as 1.0.2 but with added composer conflict section

1.0.3

add conflict composer option for robo >=0.4.6

Version to use with Robo 0.4.5

Just a small phpdoc fix, CHANGELOG and making sure, Robo 0.4.5 is used.
Robo 0.4.6 introduced a BC break in traits.

Update for Robo 0.5 pending.