A lot of improvements

-added $pivotIdsAttributes
-fix attaching() for array value pairs
-improve tests
-improve docs
-simplify BelongsToManyCustom
-remove unused from composer.json
-update TestCase and ServiceProvider for all laravel versions (5.2. 5.3. 5.4. 5.5)
-add PHPUnit file

A lot of improvements

apply changes from master
https://github.com/fico7489/laravel-pivot/releases/tag/2.1.1

A lot of improvements

apply changes from master
https://github.com/fico7489/laravel-pivot/releases/tag/2.1.1

A lot of improvements

apply changes from master
https://github.com/fico7489/laravel-pivot/releases/tag/2.1.1

initial package release

initial package release