documentation error in generic model example

[Asw1n]

The example code of the generic lineair model (https://www.npmjs.com/package/kalman-filter?activeTab=readme#instanciation-of-a-generic-linear-model) gives an error. See below for the error. I managed to track this down to the observation missing a covariance element. When I change observation to

observation: {
    dimension: 3,
    covariance: [1, 1, 1, 0.01, 0.01, 0.01]
  }

the example will run.

Uncaught Error Error: observation.covariance : Only arrays and functions are authorized (got: "undefined")
at module.exports (file:///C:/Develop/speedandcurrent/node_modules/kalman-filter/lib/utils/to-function.js:25:9)
at modelsParametersToCoreOptions (file:///C:/Develop/speedandcurrent/node_modules/kalman-filter/lib/kalman-filter.js:106:16)
at KalmanFilter (file:///C:/Develop/speedandcurrent/node_modules/kalman-filter/lib/kalman-filter.js:126:23)
at (file:///C:/Develop/speedandcurrent/kalmantest.js:7:17)
at Module._compile (node:internal/modules/cjs/loader:1256:14)
at Module._extensions..js (node:internal/modules/cjs/loader:1310:10)
at Module.load (node:internal/modules/cjs/loader:1119:32)
at Module._load (node:internal/modules/cjs/loader:960:12)
at executeUserEntryPoint (node:internal/modules/run_main:81:12)
at (node:internal/main/run_main_module:23:47)

I managed to track this down to the observation