Merge pull request #374 from hisa-tanaka/patch-1

Update td-agent-v2-vs-v3-vs-v4.md

Author: cosmo0920

quickstart/td-agent-v2-vs-v3-vs-v4.md

@@ -2,7 +2,7 @@
 
 ## Supported Platforms
 
-[Treasure Data, Inc.](https://www.treasuredata.com) maintains stable packages for Fluentd and canonical plugins as Treasure Agent \(the package is called `td-agent`\). `td-agent` has v2, v3 and v4.
+[Treasure Data, Inc.](https://www.treasuredata.com) maintains stable packages for Fluentd and canonical plugins as Treasure Agent \(the package is called `td-agent`\). `td-agent` has v2, v3 and v4. [Calyptia, Inc.](https://calyptia.com/) maintains stable packages as Calyptia-fluentd as another option. Supported OS is the same as td-agent v4 currently.
 
 | Platform | v2 | v3 | v4\(x86\_64\) | v4\(Arm64\) |
 | :--- | :---: | :---: | :---: | :---: |