Change to GraphQL api endpoint BirthdayCometRootQuery

[mobeigi]

Changes:

• Use GraphQL BirthdayCometRootQuery endpoint
• Remove old/now redudant code for the async endpoint
• Update docs and requirements

Test changes by comparing previous and current ICS outputs:

• Same number of events
• Same data (except timestamp)
• Really need tests!

[bonelifer]

Is the year included by default or is there a runtime flag needed?

[mobeigi]

Is the year included by default or is there a runtime flag needed?

After your comment, I just checked for a first time in a long and it turns out Facebook have recently added the years into their API for us to use. I've updated the code to now include years (v1.2.4 supports it).