Update credo dependency to fix warning

[theodowling]

Resolve issue #90

I've also updated dependencies and fixed some credo warnings.

[nelsonic]

Travis-CI build appears to fail because app cannot connect to Postgres ...

connection refused - :econnrefused

https://travis-ci.org/dwyl/library/builds/593206304#L428

[nelsonic]

Going to restart/rerun the build on this PR and see if it passes in light of: #94 (added postgres) ...

[nelsonic]

@theodowling looks like the PR won't pass CI until you either rebase on master or add the lines:

services: # ensure that Travis-CI provisions a DB for our tests
  - postgresql

to the .travis.yml file.

https://travis-ci.org/dwyl/library/builds/593679274#L466

Thanks for the PR BTW! 🥇

[codecov]

Codecov Report

Merging #91 into master will decrease coverage by 1.09%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master     #91     +/-   ##
========================================
- Coverage     100%   98.9%   -1.1%     
========================================
  Files          17      17             
  Lines         270     274      +4     
========================================
+ Hits          270     271      +1     
- Misses          0       3      +3

Impacted Files	Coverage Δ
lib/library_web/controllers/login_controller.ex	93.33% <0%> (-6.67%)	⬇️
lib/library_web/views/component_view.ex	98.27% <0%> (-1.73%)	⬇️
lib/library_web/controllers/plugs/set_user.ex	100% <0%> (ø)	⬆️

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[theodowling]

Thanks for the tip @nelsonic - rebasing resolved the travis issue.

[nelsonic]

@theodowling thanks for updating. 🙌

Even though codecov is unhappy, I'm fine with merging as coverage will be improved in the next PR. 👍