Acquisition fix

[0.0.3] - 2019-03-10

Added

• A change log was added.
• Added a message when the server started in the stadin

Changed

• fix rel and type for acquisition
• In the code change where the parameters are defined.
• Changed serveFeedauthor parameter for the author.
• Adding host parameter.
• Start using go modules.
• Fixing typo in file extension gif
• The mime type for FB2 changed to text/fb2+xml

Removed

• vendor folder.

A litle better, using builders

v0.0.2

updating vendor folder

All green

Finally I tested with: https://opds-validator.appspot.com

And it seems ok.