Compatibility release

Switch to IsTerminal implementation from golang.org/x/crypto/ssh/terminal

Compatibility release

Fix a small incompatibility bug

Compatibility release + small features

Make the codebase compatible with new logrus import path. Additionally:

• New DisableUppercase option
• Improve logfmt output readability

Introduce color themes

This release introduces user-configurable color themes based on mgutz/ansi style syntax.

BREAKING CHANGE!!!
Timestamp format behaviour has changed. Now there's no ShortTimestamp bool setting. It was replaced with FullTimestamp bool. Now short timestamp is used by default.

Logrus compatibility release

Update codebase to be in sync with changes introduced by sirupsen/logrus#471
Now it's compatible with logrus >= 0.11.1

Bugfix release

Fixes issue with DisableTimestamp and colored output

Initial release

Add 'Installation' section to README