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unreleased

Drop Timex as dependency. This required a custom IANA file parser for determining timezones and rules that was able to parse timezone abbreviations. Doing so requires the use of Elixir functions introduced in Elixir 1.11.
Bump NimbleParsec which requires Elixir 1.12.

Switch to pre-compiled combinators so that NimbleParsec is not needed during compilation-- why have everyone else compile this when we can compile it before publishing?
Update examples to be a Livebook
Fix serial parser matching on time
Fix assume_date option with time results from parse function.
Support Month-Year format; please note that this essentially requires a fallback assume_date since there is not a data structure that only describes Month and Year in Elixir.

Stricter time parsing by requiring time separators. For example, 949 used to be parsed as 09:49:00, but is now considered not valid. This is to help decrease false positives of nonsensical times such as 25:00 am (incorrectly parsed as 02:05:00). Thanks @fcapovilla (PR #46)

Correct handling of 12:xx:xx AM timestamps (12hr). These were incorrectly parsed as 12:xx:xx (24hr) timestamps when they should have been 00:xx:xx (24hr) timestamps.
Lock Timex to >= 3.2.1 and <= 3.7.2 to avoid timezone conversion issues when using to_utc: true. Looks like there are some breaking changes (for us)

Adjust tokenizer to prefer month/day before of day/month when those are the only found tokens. Thanks @mwean raising the issue.

Add option use_1904_date_system for the serial parser. It defaults to false. Most spreadsheet applications use the 1900 date system, but Microsoft Excel on Macintosh in particular used the 1904 date system [@fcapovilla].

Change parse_datetime to no longer assume time. Previously, it would assume 00:00:00 if it could not be parsed. This is replaced with an opt-in option assume_time. See next point. If you relied on this, to upgrade add the option; eg: DateTimeParser.parse_datetime(string, assume_time: true)
Change parse_datetime to no longer convert DateTime to UTC timezone. If you relied on this, to upgrade add the option; eg: DateTimeParser.parse_datetime(string, to_utc: true)
Change parse_date to no longer assume a date. Previously, it would assume the current date, and replace the found information from the string. This is replaced with an opt-in option of assume_date. If you relied on this, to upgrade add the option; eg: DateTimeParser.parse_date(string, assume_date: true)

Fix a UTC conversion bug between Daylight/Standard time (#20). If you're using an earlier version and converting to UTC, please upgrade to >= 1.0.0-rc2 immediately.
Fix an epoch subsecond parsing bug (#16) (thanks @tmr08c)
Updated for compatibility with Elixir 1.10.0

Add parse/2 that will respond with the best match. This function accepts all options introduced below.
Change parse_datetime/1 to parse_datetime/2 to accept options:
- assume_time: true | %Time{} | false with the default of false.
Change parse_date/1 to parse_date/2 to accept options:
- assume_date: true | %Date{} | false with the default of false.
Add support for parsing negative epoch times. (#24) (thanks @tmr08c)
Add bang variants, parse!/2, parse_datetime!/2, parse_time!/2, and parse_date!/2
Added parsers: [] option to add or disable parsers. This is helpful if you are don't want to consider Serial or Epoch timestamps.

Validate days of month. Previously it would allow invalid days such as Feb 30. Now it will check if the year is a leap year and allow up to 29, and otherwise 28 for Feb. It will also reject day 31 on months without 31 days.

Fix PM 12-hr conversion. The bug would convert 12:34PM to 24:34 which is not valid