Remove link to previously removed recipe

Fixes #2438.

Author: novemberborn

readme.md

@@ -156,7 +156,6 @@ We have a growing list of [common pitfalls](docs/08-common-pitfalls.md) you may
 - [Passing arguments to your test files](docs/recipes/passing-arguments-to-your-test-files.md)
 - [Testing React components](docs/recipes/react.md)
 - [Testing Vue.js components](docs/recipes/vue.md)
-- [JSPM and SystemJS](docs/recipes/jspm-systemjs.md)
 - [Debugging tests with Chrome DevTools](docs/recipes/debugging-with-chrome-devtools.md)
 - [Debugging tests with VSCode](docs/recipes/debugging-with-vscode.md)
 - [Debugging tests with WebStorm](docs/recipes/debugging-with-webstorm.md)