Create a Changelog about rust-embed

[pyrossh]

Yeah I think we could do one of those. I thought no one was using this library so didn't bother.
I think something like this format will be good.
https://github.com/react-native-community/react-native-releases/blob/master/CHANGELOG.md
Also there is one known issue that the code generated for large files by the proc macro gets too huge that the rust parser starts choking at the lexer and takes too long to compile.
I tried to get a solution using the rust built in include_bytes!() which seemed to solve the perf issue but then changed the api significantly. So the changelog will be really useful here.

[AzureMarker]

This is a useful site: https://keepachangelog.com/

[AzureMarker]

When do you plan on making a new release? I see the CI is currently failing, but I think it is an issue with nightly and another dependency.

[pyrossh]

Its an issue with the nightly version. Should have hardcoded the nightly version in the travis script.
Also should add the nightly version that this package works with in the readme. Also try to move away from nightly to stable if its possible.
Didn't get much time to work on it. Will try to add the changelog this weekend and workout the travis issues for now.
Also is it breaking for you? Then we need to find/explore ways to move it to stable rust even if the api changes a bit.

[AzureMarker]

I'm on an older nightly, and the master branch works for me (nightly-2018-03-07).

[pyrossh]

Hmmm... It seems travis doesn't support specifying a nightly version. Also other nightly based projects like rocket also seem to be braking.

[AzureMarker]

You can test manually and release with a supported version of nightly specified.

[pyrossh]

Changelog Done. Thanks for the push.