Change file extensions to .jsx

[mansogf]

Is your feature request related to a problem? Please describe.
It would be great if we can change the extensions of the existing files in the project from js to jsx.

Describe the solution you'd like

• Change file extensions to .jsx

• P.S: After this change, the software must keep working properly.

Additional context
More details can be found here: airbnb/javascript#1235

[fellipe-araujo]

I will solve this issue.

[fellipe-araujo]

I finished this issue. PR #56