Fix warnings

[monkeygroover]

Fixes unused variable and deprecation warnings.

Note there are a lot of deprecations from old versions of dependencies, to fix these requires elixir 1.9+

[monkeygroover]

Looks like the CI infra will need bumping too for this to work?

[Adriandmen]

Indeed. I just chose the same versions that were used in the old ,travis.yml file. Bumping these versions up should do the trick.

[codecov[bot]]

Codecov Report

Merging #188 (931c773) into master (5bc0153) will decrease coverage by 1.24%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #188      +/-   ##
==========================================
- Coverage   95.77%   94.52%   -1.25%     
==========================================
  Files          23       23              
  Lines        1799     1974     +175     
==========================================
+ Hits         1723     1866     +143     
- Misses         76      108      +32     

Impacted Files	Coverage Δ
lib/interp/commands/special_interp.ex	94.28% <0.00%> (-2.54%)	:arrow_down:
lib/interp/interpreter.ex	92.59% <ø> (-5.14%)	:arrow_down:
lib/interp/commands/binary_interp.ex	98.87% <100.00%> (ø)
lib/commands/matrix_commands.ex	95.00% <0.00%> (-5.00%)	:arrow_down:
lib/interp/functions.ex	88.77% <0.00%> (-4.49%)	:arrow_down:
lib/reading/input.ex	97.14% <0.00%> (-2.86%)	:arrow_down:
lib/commands/list_commands.ex	94.96% <0.00%> (-2.28%)	:arrow_down:
lib/commands/int_commands.ex	96.75% <0.00%> (-2.20%)	:arrow_down:
... and 10 more

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[Adriandmen]

Looks good to me, thanks! Dismissing the codecov checks, those are irrelevant.

[monkeygroover]

not sure where is best to discuss 05ab1e stuff, so i'll just leave this here.

I'm playing around with an elixir livebooks for interactive 05ab1e experimentation, if i get anything useful working i'll post it somewhere.

also thanks for creating 05ab1e!