The folders at https://www.espruino.com/binaries/travis/?C=M;O=D are named after their corresponding commits. Inside them the firmware version number can be read. So that's one way to find 2v19 corresponding commit.
Then you can reset your git cloned folder/fork to that commit and build.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
The folders at https://www.espruino.com/binaries/travis/?C=M;O=D are named after their corresponding commits. Inside them the firmware version number can be read. So that's one way to find 2v19 corresponding commit.
Then you can reset your git cloned folder/fork to that commit and build.