Change the Copyright year from 2010 to 2018

[jin940]

Prerequisites

• [x] I have written a descriptive pull-request title
• [x] I have verified that there are no overlapping pull-requests open
• [x] I have verified that I am following the Nancy code style guidelines
• [x] I have provided test coverage for my change (where applicable)

Description

[thecodejunkie]

Thank you

However that is not quite how it works, since I'll be closing this pull-request

Here is an explanation on why the same change has been rejected before https://github.com/NancyFx/Nancy/pull/2793#issuecomment-331716994

Have a great day!

/A

[jin940]

Thank you for letting me know. Can I help in translating how_to_build.txt or other part into Chinese version??