Can not load "typescript", it is not registered!

[dadepo]

The instruction in the readme only mentions to:

1. Install by running npm install karma-typescript-preprocessor --save-dev
2. Update the preprocessors as follows: preprocessors: { '**/*.ts': ['typescript']}
3. Configure typescriptPreprocessor

I did all these three but when I run the test I get an error saying:

:ERROR [preprocess]: Can not load "typescript", it is not registered!
  Perhaps you are missing some plugin?

Is there an instruction step that is missing?

[dadepo]

An instruction step was missing in the README. Added it here #73