Desmos API v1.8.2 released

[desmos-api-announce]

Desmos has released v1.8.2 of the API. You can find the relevant section of the changelog here.

This patch adds a GraphingCalculator.openKeypad() method and fixes an issue introduced in v1.8.0 that could prevent webpack and other bundlers from bundling the API.

We are happy to help all of our partners upgrade to v1.8.2 in a timely fashion. Please email Chris Lusto (ch...@desmos.com) with any questions.