Update version to 0.26.0

Add docs for server-side batching in Python predictor

(cherry picked from commit 36f7e95)

Update stable version to 0.24.1

Update version to 0.24.0

Update README.md

Update stable version to 0.22.1

GitBook: [0.22] 60 pages modified

Update version to 0.21.0

Update version to 0.20.0

Update version to 0.19.0