Jssha dependency is deprecated

[nicholaschiang]

The jssha@v2 version that you're currently using is deprecated and prints a warning during installation:

➤ YN0061: │ jssha@npm:2.4.2 is deprecated: jsSHA versions < 3.0.0 will no longer receive feature updates

Consider upgrading to v3 and then updating the other Percy packages that depend on this percy-client package (namely @percy/agent):

   ├─ @percy/agent@npm:0.28.6 (via npm:^0.28.5)
   │  └─ percy-client@npm:3.8.0 (via npm:^3.2.0)
   │     └─ jssha@npm:2.4.2 (via npm:^2.1.0)

[Robdel12]

Hey @nicholaschiang thanks for the issues! This library is essentially deprecated. Here's the new library: https://github.com/percy/cli/tree/master/packages/client

Once our SDKs are migrated over to the new CLI toolchain we'll officially mark this package as deprecated: https://docs.percy.io/docs/migrating-to-percy-cli