[openstreetmap/openstreetmap-website] Bundle Install update (#2299)

[caduguedess]

Seems like the INSTALL.md part that says about bundle install is outdated.
With the `bundle install` command it gives an error
With the `gem install bundle` command it works.
![bundle](https://user-images.githubusercontent.com/51020710/60609843-f5722880-9d98-11e9-93f3-516a13a2b4d8.png)


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