Allow error handler to be defined for socket errors. (#169) [@cosmastech](https://github.com/cosmastech)

• Fix the array shape for configuration (#159) [@lcobucci][]
• Fix Windows errors caused by 1.6.3 (#162)

• Reverts the breaking origin detection changes from 1.6.3. These changes will be included in 1.7.0.

• Add getter for BatchedDogStatsd::$bufferLength (#151) @cosmastech

• Add support for DD_DOGSTATSD_URL environment variable (#148) @fernandocarletti
• Apply check for IPv6 addresses (#146) @NickStallman

1.6.0 / 2023-05-10

• Add support for Unified service tagging
• Remove lib-curl dependency and support for events API (using APP_KEY). Submitting events now requires a connection to a Datadog Agent.

• Fix warnings to support PHP 8.2

• Fix test support for multiple PHP versions. thanks to @Lewiscowles1986
• Normalize sample rate

• Fix regression preventing string values in set(). thanks to @colinodell
• Fix boolean tag values, thanks to @roippi
• Adding suppport for a metric prefix, thanks to @scott-shields-github
• Add CircleCI status badge, thanks to @peter279k

• Fix Add PHPCS + style updates, thanks to @timrourke
• Fix normalizeStat number_format, thanks to @umpirsky and @ManInTheBox

• Fix 0 gauge not emitter, thanks to @ZymoticB.

• Fix numbers format on non US local, thanks to @TheBooper.

• Add telemetry to the client. See official documentation for more information.
• Drop support for PHP 5.3, 5.4 and 5.5. Minimum supported version is now 5.6.
• ext-sockets is now part of the composer requirement. Thanks to derek9gag.

• Add the DD_AGENT_HOST and DD_DOGSTATSD_PORT environment variables support for client configuration
• Get the dd.internal.entity_id tag from the DD_ENTITY_ID environment variable

• Add support for global tags, thanks to @Firehed

• Add support for UDS socket (agent >= 6.0), thanks to @CrshOverride

• Add support for new "distribution" metric type
• Allow to increment/decrement by a certain amount

1.0.2 / 2018-06-21

• Keep packages sorted in composer.json, thanks to @localheinz.

1.0.1 / 2018-06-21

• Fix PHP 5.3 syntax, thanks to @zhukovra

1.0.0 / 2017-12-20

• Respect PSR4, huge thanks to @onema
• Library API is now object oriented

0.5.0 / 2017-12-20

• Update code to respect PSR1 and PSR2
• Add support for 'aggregation_key' and 'source_type_name' for UDP events
• Escape line break in event text over UDP
• Align tags behaviour across all function and between UDP and TCP
• Handle tags with no values
• Allow single tags to be passed as strings and format multiple tags correctly (thanks to @krixon)

0.4.0 / 2016-05-24

• Add the ability to send events via both TCP and UDP (default is UDP)
• Update file_get_contents to cURL for better TCP event submission reliability
• Add ability to configure SSL verification for cURL request (default validates host/peer)
• Random code cleaning (spellchecking, fixing invalid typing, etc.)
• Thanks to [@folkhack][], [@jmparks-ebates][], [@Amaroq1][] and [@baweinbe][] for this ([#41][]).

0.3.0 / 2015-07-27

• [BUGFIX] Fix report_metric bad reference to report method in BatchedDatadogstatsd class, #27
• [BUGFIX] Reference private variables with self:: instead of static::, #24 (thanks [@shadowhand](https://github.com/shadowhand))
• [OTHER] Add a 3-clause BSD license, #4 #28
• [OTHER] Add a Changelog #28
• [OTHER] Add PHP 5.3 requirement to the composer, #26
• [OTHER] Readme update to reflect last changes, #23 #25 #26 (thanks [@bigthyme](https://github.com/bigthyme))