Added ^4.0 version of laminas-hydrator, dropped old dependency

[tasselchof]

Fixed issues #13 and #22.

[Ocramius]

Seems like everything is failing.

Few things to fix:

1. PR title
2. Build failures (tests, static analysis)

[tasselchof]

@Ocramius I bumped into phpro/zf-doctrine-hydration-module problem and this module is abandoned.

Problem 1
    - laminas-api-tools/api-tools-doctrine[2.1.0, ..., 2.2.1] require phpro/zf-doctrine-hydration-module ^2.0.1 || ^3.0 -> satisfiable by phpro/zf-doctrine-hydration-module[v2.0.1, v3.0.0].
    - laminas-api-tools/api-tools-doctrine[2.3.0, ..., 2.4.0] require phpro/zf-doctrine-hydration-module ^2.0.1 || ^3.0 || ^4.1 -> satisfiable by phpro/zf-doctrine-hydration-module[v2.0.1, v3.0.0, v4.1.0].
    - phpro/zf-doctrine-hydration-module v2.0.1 requires doctrine/doctrine-module ~1.0 -> found doctrine/doctrine-module[1.0.0, 1.0.1, 1.1.0, 1.2.0] but it conflicts with your root composer.json require (^4.1.0).
    - phpro/zf-doctrine-hydration-module v3.0.0 requires doctrine/doctrine-module ^1.2 -> found doctrine/doctrine-module[1.2.0] but it conflicts with your root composer.json require (^4.1.0).
    - phpro/zf-doctrine-hydration-module v4.1.0 requires doctrine/doctrine-module ^1.2 || ^2.1.7 -> found doctrine/doctrine-module[1.2.0, 2.1.7, 2.1.8, 2.1.9, 2.1.10] but it conflicts with your root composer.json require (^4.1.0).
    - Root composer.json requires laminas-api-tools/api-tools-doctrine ^2.1 -> satisfiable by laminas-api-tools/api-tools-doctrine[2.1.0, ..., 2.4.0].

This module requires "doctrine/doctrine-module": "^1.2 || ^2.1.7", so we can't update it unless we fix it there.

[tasselchof]

Hey, @Ocramius how to run those CI tests to get it done?