This PR tries to clean up the markdown format and go for a more minimal appearance:

Today:

With changes: (and title set to empty string)

Note this removes the version / vcs url / date from the top lines of the output. What's really happening is that the title has been set to "", however, it would default to {{ .Version }} if nothing is provided. I wanted to remove the top lines since the github releases page already has this information, for example:

...with the top fields removed it reads a lot better. However, there may be users that are depending on the version being somewhere in the top of the document. For that reason the title now allows for templating and defaults to {{ .Version }}.

Detailed changes:

• if there is no title, do not render it (leaves out a since # at the top of the document)
• allow for templating in the user title and set the default title to the .Version value
• condense link annotations by removing square brackets and removing unnecessary words such as Issue and PR
• adds all reference links in a single parenthetical statement
• add @ in front of usernames (which the releases page should incorporate in a "contributors" footer)
• ensure each changelog entry does not end in punctuation. This is to separate out the change description from the references.
• full changelog link has been moved to the bottom of the document since it allows for a deeper, more raw dive into the changes, and leaves the summary of changes to flow to the top of the document.

Fixes #87