Update changelog, readme, licenses

CHANGELOG.md

@@ -21,6 +21,7 @@
 #### New Processors
 
 - [template](/plugins/processors/template/README.md) - Contributed by @RobMalvern
+- [s2_geo](/plugins/processors/s2_geo/README.md) - Contributed by @alespour
 
 #### New Outputs
 

README.md

@@ -365,6 +365,7 @@ For documentation on the latest development code see the [documentation index][d
 * [printer](/plugins/processors/printer)
 * [regex](/plugins/processors/regex)
 * [rename](/plugins/processors/rename)
+* [s2_geo](/plugins/processors/s2_geo)
 * [strings](/plugins/processors/strings)
 * [tag_limit](/plugins/processors/tag_limit)
 * [template](/plugins/processors/template)

docs/LICENSE_OF_DEPENDENCIES.md

@@ -51,6 +51,7 @@ following works:
 - github.com/gobwas/glob [MIT License](https://github.com/gobwas/glob/blob/master/LICENSE)
 - github.com/gofrs/uuid [MIT License](https://github.com/gofrs/uuid/blob/master/LICENSE)
 - github.com/gogo/protobuf [BSD 3-Clause Clear License](https://github.com/gogo/protobuf/blob/master/LICENSE)
+- github.com/golang/geo [Apache License 2.0](https://github.com/golang/geo/blob/master/LICENSE)
 - github.com/golang/mock [Apache License 2.0](https://github.com/golang/mock/blob/master/LICENSE)
 - github.com/golang/protobuf [BSD 3-Clause "New" or "Revised" License](https://github.com/golang/protobuf/blob/master/LICENSE)
 - github.com/golang/snappy [BSD 3-Clause "New" or "Revised" License](https://github.com/golang/snappy/blob/master/LICENSE)