Log Message:
Update py-certbot and py-acme to 0.9.1.

No changelog available, issues closed since 0.8.1:

certbot 0.9.1
- Make --quiet reduce the logging level

certbot 0.9.0
- Allow tests to pass without dnspython
- Remove psutil dep
- Renew symlink safety
- Update Nginx redirect enhancement process to modify appropriate
  blocks
- If lineages are in an inconsistent (non-deployed) state, deploy
  them
- Restructure how Nginx parser re-finds vhosts, and disable
  creating new server blocks.
- Remove pointless question
- Tie Nginx OCSP stapling to enhancements system
- Nginx server block selection: Handle non-80/443 ports
- Include log retention count to 1000.
- Make parser.py: add_server_directives documentation consistent
  with functionality
- Fix Nginx prompt
- Make Nginx error out if no matching server block is found
- Only suggest names LE will accept
- Implement Nginx server block selection
- should_autorenew ignores symlinks
- Fixes cffi errors in Travis during oldest tests
- DNS challenge support in the manual plugin and general purpose
  --preferred-challenges flag
- Fixed hash_bucket_size detection for nginx
- Support both invalidEmail and invalidContact errors
- Removes duplication between README.rst and resources.rst
- Psutil tests
- Allow tests to run when psutil isn't available
- Tests fail on Certbot package due to missing psutil dependency
- Hide the Nginx plugin
- Add the Nginx plugin to certbot-auto
- OCSP stapling in Nginx
- Nginx plugin selection
- Add certbot-nginx to certbot-auto
- Missing links in README
- clarify invalid email error in non-interactive
- Replace '-' with '_' before filtering plugin settings
- Fix extra or lack of spacing between words in help for renew
  flags
- Fix Travis tests
- Avoid importing conflicting security policy directives
- Change log rotation scheme
- Plugins with hyphens do not receive their args during renewal
- Handle dns01 challenge into the manual plugin [see #3466]
- Enable unit tests of certbot core on Python 3
- Add os-release ID_LIKE parsing if original distribution mapping
  not found in constants
- Fix README typo
- Nginx plugin domain selection
- Fix spacing of nginx redirect blocks
- Rationalise challenge and port selection flags
- Remove psutil from requirements.txt
- prevent Github commits from modifying certbot-auto and
  letsencrypt-auto
- Gradually remove psutil dependency, bugfix [URGENT]
- psutil fails to install because hash is missing when running
  certbot-auto
- Failure to start Nginx after configuring redirect
- Prepare docs to turn off the wiki
- Certbot apache plugin fails with TypeError: 'NoneType' object
  has no attribute '__getitem__'
- Change fatal warning to a fatal message
- Fatal warnings
- Apache default default
- Deprecation fixes
- New docs structure and introduction
- Nginx charset_map and ${VARIABLE_SUBSTITUTION} parsing
- Unclear error about invalid email in non-interactive mode
- Use simple socket test for port availability if psutil not found
- Python 3 support for certonly
- Set dialog widgets to use autowidgetsize
- Errors when run without root
- Apache plugin PATH fallback
- Automatically enable EPEL after prompting users
- Multi-topic help listings
- Installer error
- Explain why Apache [appears] not to be installed
- ErrorHandler causing errors
- Update FreeBSD package name
- Comment out corresponding RewriteConds for filtered RewriteRule
- Permissive parsing of nginx map blocks
- add nginx round-trip tests to tox/travis
- Fix Unix signal handling in certbot.error_handler.ErrorHandler
- Resuming error handling functions after a signal
- Only write nginx config files if they've been modified
- If the user picks "cancel" from the Apache vhost selection menu,
  Certbot doesn't exit
- certbot removes http->https rules corrupts ruleset
- Fix typo
- Better document plugins and reversion
- Nginx parser apparently can't parse "map"
- Nginx plugin shouldn't write files it hasn't changed
- Fix Nginx reversion
- Merge Augeas fix for comment line continuations
- Remove warning about nginx options file
- Explain the most likely cause of a missing replay nonce error
- Bump pyca package versions
- Don't add wildcard listen if user has more specific
  configuration
- Remove unused nosexcover dependency
- Cleanup dev setup
- Nginx space preservation
- Set dialog widgets to use autowidgetsize
- Printing pip output to terminal when -v is used
- Log new cert and cert renewal
- Log whether renewing or obtaining a new certificate
- Added the argument --quiet and -q so then when used with a
  regular user there is no output to the screen.
- certbot-auto not quiet when used with regular user
- Adding sensible UI logging for typical user
- Replace psutils dependency
- Display DialogError details correctly
- -v implies --text
- Fix FQDN checks, closes #3057 and #3056
- Bug in FQDN detection: installer wrongly interprets _
- Installer thinks bare TLD is not a valid FQDN
- Limiting tox envlist to really needed tests
- trouble with Listen directives in CentOS 7 / ssl.conf
- Remove dangling footnote
- certbot-apache fails to parse files with comma in the filename
- pip and verbosity
- Dialog error messages
- NcursesDisplay.menu: treat ESC as cancel
- More useful error when running as non-root?
- -v should imply --text
- Update tox/instructions
- Error that results when run without root is unclear
- Enable EPEL in RPM bootstrapper
- Add dns-01 challenge support to the ACME client
- Apache plugin fails to parse OWASP's ModSecurity ruleset
- Audit nginx plugin for guaranteed config reversion in case of
  error
- NoInstallationError() from Apache plugin within renewal cron
  jobs due to /usr/sbin not being in the PATH
- nginx http redirect
- "No installers" error message not clear
- HelpfulArgumentParser should know about flags that are relevant
  to several topics
- Nginx configurator should preserve whitespace on output
- server blocks added to nginx.conf
- Nginx fails if ssl_session_cache already defined
- nginx leaves dirty/modified config files
- Sensible UI logging for typical user
- nginx plugin issue with server block containing multiple
  servernames