This repository is now deprecated.
Please refer to the new mono-repo location here: https://github.com/ag-grid/ag-grid, with this specific Framework Project living here: ag-grid-polymer.
Version 18.0.0 will be the last version in this repository. All future versions will be in the repository above.
The code here (version 18.0.0) supports Polymer 2.x.
Version 19 onwards supports Polymer 3.x and can be found here: ag-grid-polymer.