fix: update minimal reflection-docblock version (#41)

Author: VincentLanglet

composer.json

@@ -22,7 +22,7 @@
     "require": {
         "php": ">=7.0",
         "netresearch/jsonmapper": "^1.0 || ^2.0",
-        "phpdocumentor/reflection-docblock": "^4.0.0 || ^5.0.0"
+        "phpdocumentor/reflection-docblock": "^4.3.4 || ^5.0.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^6.0.0"