update docs

Fix compatibility of RecurrentPaymentFactory (contributte#76)

closes contributte#74

EET: implement urceno_cerp_zuct and cerp_zuct attributes (contributte#70

)

Co-authored-by: Jan Eliáš <[email protected]>

Contributte style (contributte#61)

* Apply phpstan and coding standards

* Add Makefile

* Move docs to .docs/

* remove unnecessary gamee/php-code-checker-rules

* travis-ci: drop php 5.6 and 7.0

* Fix versions table

Payment factory - validator cena jednotlivých položek (contributte#58)

closes contributte#41

README: Fix class name in sample extension. (contributte#55)

Composer: fix licence

Feature: Missing BITCOIN PaymentInstrument (contributte#36)

Recurrent payments functionality tests added

Release v1.1.0