…options which allows to keep the original line formatting (#66)

* An additional parameter keepLines has been added into the formatting options which allows to keep the original line formatting

* Resolving the reviews and simplifying the code with the function `multipleLineBreaks`

* Reverting back to the previous commit and applying the review changes

* cleaning the code, simplifying the if/else cases

* Updating the dependencies of package.json to their latest versions. Changed `withFormatting` so that keepLines option is always false.

* Solving "Invalid: lock file's ... does not satisfy"

* testing if higher node version in .travis.yml will solve the failing of CI

* formatting and let-> const, avoid modification of options

Co-authored-by: Martin Aeschlimann <martinae@microsoft.com>