Upgrade rebar3 to latest stable one

... without deviations from upstream.

Fetched using:
```
curl -sSLO https://github.com/aeternity/rebar3/releases/download/3.11.1-aeternity.1/rebar3
```

That tag is commit c5eecfc.
This commit is contained in:
Luca Favatella 2019-06-11 09:30:00 +01:00
parent 093a5ff766
commit c411f11fd0

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rebar3

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