update deps

do not report an already up-to-date role as updated

update deps

improve roles updates output, fixes #4

do not add changes for failed roles

return exit code 1 on errors, do not just log errors, fixes #2

fix requirements.yml corruption; add automatic deduplication; update deps

reduce the amount of details in progress bars (do not print roles without updates)

print changes one-per-line

update readme

update linter config

add progressbars to requirements and roles updates

update deps; update aux files

add --limit to control amout of parallel downloads

add automatic retry mechanism for git pulls