PR: Update `Phoenix` Version + Mention `fields` in `README.md` #36

[nelsonic]

• [x] add table of contents 📝
• [x] link to https://github.com/dwyl/fields #30 🔗
• [x] update Phoenix from 1.4 to 1.6 ⬆️
• [x] update :crypto API #22 ₿
• [x] add "Understanding Advanced Encryption Standard (AES)" section #24 + #37

[nelsonic]

cascade of failures because of newer Erlang removing :crypto.block_encrypt/4 ... :facepalm:

[nelsonic]

Getting the error:

** (Mix) The task "compile.gettext" could not be found. Did you mean "compile.leex"?

🙄

[nelsonic]

Dang it. Updating this to repo from Phoenix 1.4 to 1.6 is turning into a bigger PR than I would have liked ... 🙄

[codecov[bot]]

Codecov Report

Merging #47 (8e879ec) into main (3f89df2) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #47   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9        11    +2     
  Lines           36        65   +29     
=========================================
+ Hits            36        65   +29     

Impacted Files	Coverage Δ
lib/encryption/application.ex	100.00% <ø> (ø)
lib/encryption_web/router.ex	100.00% <ø> (ø)
lib/encryption/aes.ex	100.00% <100.00%> (ø)
lib/encryption/encrypted_field.ex	100.00% <100.00%> (ø)
lib/encryption/user.ex	100.00% <100.00%> (ø)
lib/encryption/hash_field.ex	100.00% <0.00%> (ø)
lib/encryption/password_field.ex	100.00% <0.00%> (ø)
lib/encryption_web/endpoint.ex	100.00% <0.00%> (ø)
lib/encryption/repo.ex	100.00% <0.00%> (ø)

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[nelsonic]

@SimonLab ref #36 + Phoenix update. Thanks! 🙏