Dickinson College Farm Link

[meganenglert]

Change the text "the Dickinson College Farm" into a link to the farm in the History section of README.md.

The URL to use for the link is: https://www.dickinson.edu/farm

The "Links" section of the following document shows how to create a link using Markdown:

• https://docs.github.com/en/github/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax