Merged master into dev, since the PR #128 was opened before we created the dev branch from master.
Updated robrichards/wse-php dependency version to 2.0.3
Generated composer.lock again by deleting the old one and running "composer install", since the one checked-in into master requires PHP version >= 7.1 and the README.md says the required PHP Version for the PHP SDK should be >=5.6.24
Merged master into dev, since the PR #128 was opened before we created the dev branch from master.