Rename $attributes to $properties

[Tigrov]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	✔️
Fixed issues	#343, partially #358

[codecov]

Codecov Report

Attention: Patch coverage is 84.03756% with 34 lines in your changes missing coverage. Please review.

Project coverage is 84.99%. Comparing base (05942a1) to head (70a4cac).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/AbstractActiveRecord.php	91.05%	11 Missing ⚠️
src/Trait/ArrayAccessTrait.php	0.00%	11 Missing ⚠️
src/Trait/TransactionalTrait.php	0.00%	6 Missing ⚠️
src/ActiveRelationTrait.php	93.93%	2 Missing ⚠️
src/Trait/ArrayIteratorTrait.php	0.00%	2 Missing ⚠️
src/Trait/MagicPropertiesTrait.php	90.90%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #386      +/-   ##
============================================
- Coverage     85.32%   84.99%   -0.33%     
+ Complexity      595      587       -8     
============================================
  Files            17       17              
  Lines          1417     1406      -11     
============================================
- Hits           1209     1195      -14     
- Misses          208      211       +3     

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