Merge commit 'e988fee1679536137b87d10e939eff5c1f27c8ab' as 'libs/libzmq'

libs/libzmq/.github/CONTRIBUTING.md

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+# Pull Request Notice
+
+Before sending a pull request make sure each commit solves one clear, minimal,
+plausible problem. Further each commit should have the following format:
+
+```
+Problem: X is broken
+
+Solution: do Y and Z to fix X
+```
+
+Please try to have the code changes conform to our coding style. For your
+convenience, you can install clang-format (at least version 5.0) and then
+run ```make clang-format-check```. Don't fix existing issues, if any - just
+make sure your changes are compliant. ```make clang-format-diff``` will
+automatically apply the required changes.
+To set a specific clang-format binary with autotools, you can for example
+run: ```./configure CLANG_FORMAT=clang-format-5.0```
+
+Please avoid sending a pull request with recursive merge nodes, as they
+are impossible to fix once merged. Please rebase your branch on
+zeromq/libzmq master instead of merging it.
+
+```
+git remote add upstream git@github.com:zeromq/libzmq.git
+git fetch upstream
+git rebase upstream/master
+git push -f
+```
+
+In case you already merged instead of rebasing you can drop the merge commit.
+
+```
+git rebase -i HEAD~10
+```
+
+Now, find your merge commit and mark it as drop and save. Finally rebase!
+
+If you are a new contributor please have a look at our contributing guidelines:
+[CONTRIBUTING](http://zeromq.org/docs:contributing)
+
+# FIRST TIME CONTRIBUTORS PLEASE NOTE
+
+Please add an additional commit with a relicensing grant.
+
+[Example](https://github.com/zeromq/libzmq/commit/fecbd42dbe45455fff3b6456350ceca047b82050)
+
+[More information on RELICENSING effort](https://github.com/zeromq/libzmq/tree/master/RELICENSE/README.md)