fixed regex for backslash replacement to replace all backslashes

[kaoDev]

On windows I just had the error that a path looking like this:

someFolder\%someParam\index

got transformed to this

someFolder/%someParam\index

so only the first backslash got replaced by a normal slash.

The fix is to add a g flag to the replacement regex so that all backslashes match

[coveralls]

Coverage remained the same at 100.0% when pulling 77e0ab0 on kaoDev:fix/backslah-replace into ecc3bdd on jesseditson:master.

[jesseditson]

Nice catch!

[jesseditson]

Released here: https://github.com/jesseditson/fs-router/releases/tag/v0.4.1