Harmonize the JS Style

[UlisesGascon]

Context

• This is part of release-1.5 Roadmap for 2019-2020 #148
• Medium priority task

Tasks

• Install prettier + eslint -> prettier-eslint
• Config the task in package.json
• Upload the changes in files package*.json
• Update the README.md with the relevant information

Assignation

• This tasks is assigned to @UlisesGascon

[carlosazaustre]

I'd like to help with this issue during xmas :)

[UlisesGascon]

Awesome @carlosazaustre!! I will asign you the tasks. Please use release-1.5 branch (It is the most stable source and the final destination)