Creating getter and setter for additional properties on boolean true

[stephanniewerth]

Best practice to work with additional properties are the generated methods setAdditionalPropertyValue and getAdditionalPropertyValues. In JSON schema you can set "additionalProperties": true. So far the methods will not been created, because you need a valid Schema instance (in JSON Schema: "additionalProperties": {"type": "string"})

This pull request will created these methods with PhpStdType::mixed() as Type. You have to activate this behavior with a flag:

$builder = new PhpBuilder();
$builder->buildAdditionalPropertyMethodsOnTrue = true;

[codecov]

Codecov Report

Merging #31 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #31      +/-   ##
============================================
+ Coverage     89.21%   89.28%   +0.06%     
- Complexity      513      516       +3     
============================================
  Files            38       38              
  Lines          1354     1362       +8     
============================================
+ Hits           1208     1216       +8     
  Misses          146      146

Impacted Files	Coverage Δ	Complexity Δ
src/JsonSchema/PhpBuilder.php	84.35% <100%> (+0.73%)	69 <0> (+3)	⬆️

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[vearutop]

Thanks, v0.2.25 tagged.