Location and description optional

[aaumond]

Hi,

Is it possible to make the description and location fields optional?
I tried to create a branch on your repository to make a pull request but it was impossible.

Thanks in advance.

[aaumond]

Another small question. I see that on the master branch, it is possible to add a URL on an iOS event. But unfortunately, when I get the add_2_calendar dependency directly from pub.dev, the URL parameter is not available. Has the version been released?

[diegogarciar]

I will create a release later today, thanks for your PR