v2.3.8

Changelog

• Update client dependencies
• Update Go dependencies
• Minor updates on documentation
• Use mime package to detect mime type instead of using custom method (28fb987)
• bump node from 15.3.0-alpine to 15.9.0-alpine in Docker image (#700)
• bump golang from 1.15-alpine to 1.16.0-alpine in Docker image (cf288f7)