fix travis configuration
fix travis configuration

X-dark/wallabag,egilli/wallabag,egilli/wallabag,FabienM/wallabag,X-dark/wallabag,FabienM/wallabag,X-dark/wallabag,wallabag/wallabag,pmichelazzo/wallabag,aarizkuren/wallabag,egilli/wallabag,shtrom/wallabag,pmichelazzo/wallabag,kevmeyer/wallabag,pmichelazzo/wallabag,kevmeyer/wallabag,aarizkuren/wallabag,kevmeyer/wallabag,FabienM/wallabag,shtrom/wallabag,wallabag/wallabag,wallabag/wallabag,aarizkuren/wallabag,X-dark/wallabag,X-dark/wallabag,FabienM/wallabag,pmichelazzo/wallabag,pmichelazzo/wallabag,shtrom/wallabag,shtrom/wallabag,kevmeyer/wallabag,egilli/wallabag,egilli/wallabag,shtrom/wallabag,aarizkuren/wallabag