reduce number of tests, only test with composer v1 on 7.3 and lowest dependencies
reduce number of tests, only test with composer v1 on 7.3 and lowest dependencies

deek87/concrete5,mlocati/concrete5,hissy/concrete5,jaromirdalecky/concrete5,hissy/concrete5,concrete5/concrete5,haeflimi/concrete5,biplobice/concrete5,biplobice/concrete5,concrete5/concrete5,haeflimi/concrete5,deek87/concrete5,jaromirdalecky/concrete5,haeflimi/concrete5,haeflimi/concrete5,mlocati/concrete5,biplobice/concrete5,jaromirdalecky/concrete5,deek87/concrete5,mlocati/concrete5,jaromirdalecky/concrete5,hissy/concrete5,mlocati/concrete5,concrete5/concrete5,hissy/concrete5,concrete5/concrete5,deek87/concrete5,biplobice/concrete5