Move styled-components as a peerDependency

[lcospain]

Describe the bug
Hello, and thank you for this great component. I wanted to use your library as part of a project that depends on styled-components and saw some warnings after installation regarding styled-components being instantiated twice.

To Reproduce
Steps to reproduce the behavior:

1. Create a folder mkdir repro
2. Init npm package npm init -y
3. Install styled-components npm i styled-components
4. Install react-toggle-component npm i react-toggle-component
5. After bundling, the console should show the warning available in screenshots

Expected behavior
Styled-components should be put in peerDependencies

Screenshots
Warning message printed to the console :

Desktop (please complete the following information):

• OS: Mac Os
• Browser: Google Chrome
• Version: 74

Additional context
Add any other context about the problem here.

[gfazioli]

@lcospain Hi, interesting, I'll check soon, thx 👍

[gfazioli]

should be ok on v3.0.6