Added erlang ast test in captains-log

[FraSanga]

As described in issue #340, I modified the file by attempting to perform the check with the AST.

I am uncertain if this is correct, but the tests I added also work with the examples I created.

As soon as I get the go-ahead, I'll also make a PR on website-copy.
I hope this has been helpful. 😄

[jiegillet]

Thank you for the PR!
Before I go into a detailed review, could I ask you to address two things:

1. I don't understand why all the files you are modifying are completely redefined. As far as I could tell, you are only modifying a few lines, not the whole files. Could you figure it out and fix it? It would really help with the review and the git history.
2. The tests in test_data are used as smoke tests for the CI, we don't typically add new ones in there unless we have a good reason. The tests you added in test/elixir_analyzer/test_suite/captains_log_test.exs should be enough.

[FraSanga]

It should be fixed now.
Every time Windows messes up the formatting at the end of the line.