update from v0.1.84 to v0.1.87 broke compatibility with IE11

[Maxime Chéramy]

Describe the bug

I've updated the library from v0.1.84 to v0.1.87 and this broke the app on IE11 with the error:
Object doesn't support property or method 'repeat'

To Reproduce

Test on IE11 with v0.1.87.

Expected behavior

Working.

Additional context

I'm using webpack+babel but the node modules are not babelized.