Improve public IP detection reliability, allow some default overrides, and other improvements

This changes the source of the detected public IP from a no-longer-maintained (and no longer available!) python library, ipgetter, to AWS's checkip service.

A new commandline option (--max-tries) has also been introduced, to allow users to override the default of 5.

The script now also will update the target record if the specified TTL (via --ttl) does not match the existing record's value (i.e. it considers "mismatched TTL" to be out-of-date, not just "mismatched record value").

This release also includes a number of other improvements and fixes.

Changes since last release

• 959221e: Switch from ipgetter to AWS's IP address service
• 0163e53: Rework max-tries handling for IP retrieval
• dd6989a: Fix some PEP8 errors
• 3b68d2e: Remove unnecessary typechecking
• e19ebc9: Revise some None-based logic for readability
• fec8744: Update target record on mismatched TTL, too
• c972797: Make some methods static
• f094636: Add some examples to the documentation
• 1d7e502: Improve explanation of --ttl option

Allow importing, validate public IPs, other minor improvements

This release is not backwards-compatible, as the name of the script has changed. Using underscores instead of dashes allows the script to be imported and used elsewhere.

This release also includes a patch to validate the public IPs retrieved from the "what's my IP" services.

Changes since last release

• 10a088c: Rename script to conform to import standards
• ef403bb: Validate public IP address before using it
• 05e78b4: Replace type-check asserts with better error msgs
• fb31a46: Don't install program deps for TravisCI builds
• 03e606f: Fix incorrect whitespace

Add initial SNS support

• 325df79: Add support for pushing a message to an SNS topic upon DNS record updates

Fully-working MVP

Version 1