Log version changes for bleeding on every build

[berland]

On every bleeding build, a diff showing what has changed since last time ("yesterday") in terms of different versions should be available. For example a diff of pip freeze for the last and the current build.

This log (or a link to it) should be published to the komodo status slack channel.

[valentin-krasontovitsch]

i like this idea! how do you feel about also holding on to the output of pip freeze, and keeping it around as a dated bleeding manifest file? perhaps this is also an implied side effect to accomplish producing such a diff...