Fix travis config
Fix travis config

jl9n/phpwkhtmltopdf,mikehaertl/phpwkhtmltopdf,ProPheT777/phpwkhtmltopdf,serjee/phpwkhtmltopdf,hongtoushizi/phpwkhtmltopdf,jl9n/phpwkhtmltopdf,hongtoushizi/phpwkhtmltopdf,mikehaertl/phpwkhtmltopdf,ProPheT777/phpwkhtmltopdf,serjee/phpwkhtmltopdf