-Update CHANGELOG.md

-Update CHANGELOG.md

-Add tooltips for editors for RuleTile, RuleOverrideTile and Advanced…

…RuleOverrideTile (Unity-Technologies#281)

* -Add tooltips for editors for RuleTile, RuleOverrideTile and AdvancedRuleOverrideTile

* -Fix inspector height for TilingRule.OutputSprite.Animation -Adjust padding and line height for RuleTile editor

Updates (Unity-Technologies#202)

* -Update Contributors.md

* -Update CHANGELOG.md

-Update version to 1.4.0

-Update version to 1.3.1

-Update version to 1.3.0

-Update CHANGELOG.md

-Add 2019.1 tag

-Add 2018.3 tag