Add PriceRule and DiscountCode managers

[codecov[bot]]

Codecov Report

Merging #11 into master will increase coverage by 0.52%. The diff coverage is 98.75%.

@@             Coverage Diff              @@
##             master      #11      +/-   ##
============================================
+ Coverage     89.59%   90.11%   +0.52%     
- Complexity     1078     1144      +66     
============================================
  Files            81       85       +4     
  Lines          2671     2832     +161     
============================================
+ Hits           2393     2552     +159     
- Misses          278      280       +2

Impacted Files	Coverage Δ	Complexity Δ
src/Client.php	95.31% <ø> (ø)	22 <0> (ø)	:arrow_down:
src/Manager/PriceRule/PriceRule.php	100% <100%> (ø)	50 <50> (?)
src/Manager/DiscountCode/DiscountCode.php	100% <100%> (ø)	8 <8> (?)
src/Manager/DiscountCode/DiscountCodeManager.php	100% <100%> (ø)	4 <4> (?)
src/Manager/PriceRule/PriceRuleManager.php	75% <75%> (ø)	4 <4> (?)

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[slince]

nice