Wrong dependency on package.json

[Masahiro Yamaguchi]

Hi, thank you for the great library.

When I try to install LitMotion with OpenUPM, I got the following error.

openupm add com.annulusgames.lit-motion
WARN 404 version 1.0.0 is not a valid choice of 0.0.12-preview.2, 0.0.12-preview.5, 0.0.12-preview.8, 0.0.12-preview.10, 0.0.12-preview.11, 0.0.12-preview.13, 0.0.12-preview.17, 0.0.12-preview.19, 0.0.12-preview.20, 1.0.0-preview.1, 1.0.1, 1.1.0-preview.1, 1.1.0, 1.2.1, 1.2.4, 1.2.5, 1.2.6, 1.3.1, 1.3.2

You specify com.unity.mathematics 1.0.0 as dependency in package.json, but it seems that version 1.0.0 doesn't exist. 1.2.6 would be the good option instead.

You can see the all available versions of the package here with upm2rss.

[Annulus Games]

Changed the version specified to 1.0.1. This should now work.