Gulp4 update

• update yarn lock 48b9545
• Merge pull request #74 from wwwednesday/master fbc02b2
• Sass folders structure update 698a737
• Eslint config update abbf9e4
• remove tests c579b14
• gulp4 234f40a
• Merge pull request #73 from wwwednesday/master c6a45df
• Eslint update 1da14a1

v1.2.23...v1.3.0