Update version to 0.19.0

Update stable version to 0.18.1

Update README.md

Update stable version to 0.17.1

Update version to 0.17.0

Update stable version to 0.16.1

Increase memory requirements for examples (cortexlabs#1018)

(cherry picked from commit 1010c00)

Update stable version to 0.15.1

Update version to 0.15.0

Update stable version to 0.14.1