Support 1.6.14

[beef331]

Tests pass on 1.6.14 so not much reason not to support it for the time being. Please do make a git tag 😄

[termermc]

Docs won't generate on 1.6.14 unless uses of addr are replaced with unsafeAddr. Isn't that feature deprecated?

[beef331]

Ugh more work is required, seemed so easy to add 1.6.14 support.

[termermc]

If it's not a deprecated feature, unsafeAddr can be used in place of addr. If it is, a few when blocks can be used. It's not a big set of changes, and everything still passes on my testing with unsafeAddr.

[termermc]

Oh yeah, looks like it was deprecated: nim-lang/RFCs#369
So when can be added to the code and runnableExamples blocks without issue.

[beef331]

Yea I knew how to fix it of course, I just didnt want to have to go through and do it 😛

[termermc]

The only things that need to be updated now are the README to remove the inaccurate bit about 2.0.0 support, and runnableExamples, the latter of which could have comments explaining unsafeAddr being required pre-2.0.0