Update to v3.0.0

[simukappu]

Description of changes:

3.0.0

Plugin v3 is almost compatible with v2. You can use v3 with the same configuration as v2. For more details, please see README.

• Enhancement - Use modularized AWS SDK v3 since fluent-plugin-s3 also supports it : #152
• Enhancement - Remove support for Fluentd v0.12 and use new Plugin API : #156 (also fix #133)
• Enhancement / Breaking change - Remove chomp method from internal formatter : #142 #144
• Enhancement - Add chomp_record option for compatible format with plugin v2 : #142
• Bug - Fix undefined method error in flushing buffers : #133
• Bug - Fix dependency problem on AWS SDK : #161

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[riywo]

LGTM