Add a method for generating a date in a given year to Faker::Date

[connorshea]

Is your feature request related to a problem? Please describe.
I have a scope in my Rails app that filters video games based on their release year. I'd like to use Faker to generate a random date in a given year for my tests.

Describe alternatives you've considered

I know I can pretty much get this functionality using between, but it's not very convenient.

# with `between`:
Faker::Date.between(from: 'January 1, 2018', to: 'December 31, 2018') #=> 2018-11-20
# ideally:
Faker::Date.in_year(2018) #=> 2018-11-20

I don't know if in_year is a good name for this, but it makes sense to me. Happy to hear any suggestions or if this suggestion seems reasonable :)

Faker::Date docs

[AmrAdelKhalil]

@vbrazo Hi, Can I work on this one?

[Zeragamba]

Feel free to open a PR when you have a fix :)