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This PR instructs Travis CI also to build against Erlang/OTP 21.
So far I've not done any further testing, but only a small change was required to get it to run tests without issues. The same compiler warnings as already reported in #312 popped up, but beside this, it seems to be fine.
PS: I changed the versions to strings in
.travis.yml
. This way it is unmistakable as a version, and not as a number (e.g.1.0.0
will be interpreted as1.0
). This was not an issue, I just wanted to make it more robust.