Zincr dismissed an approval of an employee in a contributor's PR

[nolar]

Zincr dismisses an approval added by an org member to a PR, once that organisation member adds a commit to the PR (but they are not the PR opener).

This behaviour is counter-intuitive:

1. If an org member opens a PR, their voice is already counted as +1, and required only 1 extra approval from another org member.

2. If an external contributor opens a PR, 2 org member approvals are needed. 1 is usually mine, 1 extra.

3. If an external contributor opens a PR, and an org member (me) adds a commit to that PR, that member's approval is dismissed and not counted, requiring 2 extra org member approvals.

Point 3 goes against logic of points 1 & 2: if the org member is automatically counted as 1 approval in their own PRs, why shouldn't it be accepted in contributors' PRs?

Example PR: zalando-incubator/kopf#114 — here, Zincr dismissed an approval of user "nolar" when user "nolar" added a commit. In all other PRs, "nolar" was normally approving the changes (and not adding the commits).

[nolar]

Probably related: #17