add validate instaceof Model and fix current in sync method for Hybrid relation

[juniohyago]

[divine]

Hello,

Add tests, please.

Thanks!

[juniohyago]

Hello, tests ok thanks

[divine]

Hello,

Tests are failing, also fix php-cs-fixer suggestion.

Thanks!

[juniohyago]

hello, I haven't found a model for many to many hybrids, do I need to create this?

[juniohyago]

Hello, Tests are ok now, Thanks!

[codecov-commenter]

Codecov Report

Merging #2276 (26e77f6) into master (6aa6ad1) will increase coverage by 0.26%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #2276      +/-   ##
============================================
+ Coverage     88.12%   88.38%   +0.26%     
- Complexity      664      665       +1     
============================================
  Files            33       33              
  Lines          1566     1567       +1     
============================================
+ Hits           1380     1385       +5     
+ Misses          186      182       -4     

Impacted Files	Coverage Δ
src/Relations/BelongsToMany.php	87.25% <100.00%> (+1.11%)	:arrow_up:
src/Eloquent/Model.php	94.26% <0.00%> (+0.63%)	:arrow_up:
src/Eloquent/HybridRelations.php	96.15% <0.00%> (+2.56%)	:arrow_up:

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