Codacy compatibility warning.

[offtherailz]

Codacy add many compatibility warning of this type:

'const' is available in ES6 (use esnext option) or Mozilla JS extensions (use moz). Show Details
9
const CHANGE_MAP_VIEW = 'CHANGE_MAP_VIEW';

Here the list : https://www.codacy.com/app/simone-giannecchini/MapStore2/issues?&filters=W3siaWQiOiJMYW5ndWFnZSIsInZhbHVlcyI6W251bGxdfSx7ImlkIjoiQ2F0ZWdvcnkiLCJ2YWx1ZXMiOlsiQ29tcGF0aWJpbGl0eSJdfSx7ImlkIjoiTGV2ZWwiLCJ2YWx1ZXMiOltudWxsXX0seyJpZCI6IlBhdHRlcm4iLCJ2YWx1ZXMiOls0Ml19LHsidmFsdWVzIjpbXX1d

We should investigate, but probably the eslintrc is not well support or some variable is missing. Codacy suggest to use esnext element that is deprecated