Now compatible with bevy 0.13 (#82)

Fix wrong dependency

Migrate to bevy-0.12 (#78)

Merge pull request #65 from jkb0o/bevy-0.11

[bump] 0.3

[core] remove debug prints

[widgets] fix <follow> with multiple witndows crush (#75)

[widgets] add follow widget & example

[lib] update Cargo.lock

[core.element] Deprecate add_children, introduse add_child_with

[macro] remove macro from core dependency

[widgets] get rid of <br/> & <brl/> widgets

[examples] add grid example

[macro.ess] implement ess! macro for inline ess definition

[macro.ess] support css functions as style prop values