fixed error message

Update php-testing.yml

Merge pull request #184 from pluc/master

Replacing deprecated null parameter #3 of imagerotate() by 0

Merge pull request #181 from Internacionalweb/fixed-return-getcroppos…

…ition

Modified return type to avoid implicit float to int conversion

fix for 7.1

Merge pull request #132 from lefuturiste/master

add gamma correct option

Fix gamma correction

Coveralls added correctly

prepared readme for 1.8.0 version