Fix null assignment

Fix the null assignment error resulting in:
Cannot assign null to property Grphp\StatsD\Interceptor::$client of type Domnikl\Statsd\Client, if the client property is not set in options.

grphp v4.0 compatibility

This release enables support for grphp v4.0. It is still backwards compatible with 3.x.

Replace domnikl/statsd with slickdeals/statsd

The domnikl/statsd that we have previously used is abandoned and no longer supported. The slickdeals/statsd has been forked out of it and is active and supported library that we will be using moving forward.

Update composer dependencies

composer.json now has

• php: ^7.0 || ^8.0 to composer.json
• phpunit/phpunit: ^9.0
• bigcommerce/grphp: ^3.0
• domnikl/statsd: ^3.0

Moved from travis to circleci

0.1.3

Remove dependency on phpunit/timer.

0.1.2

• Bump grphp dependency to 0.3.8

0.1.1

Merge pull request #2 from bigcommerce/update-grphp

bump bigcommerce/grphp to 0.3.4 to bring in new changes

0.1.0

• Better namespaced key support
• Added full unit tests
• Added code coverage

0.0.3

• Fixed composer dependencies
• Fixed timer to properly measure in ms

0.0.2

• Initial release