upgrade project to Phoenix 1.4

[SimonLab]

ref: #14

• Update structure project to Phoenix 1.4 following Chris guide: https://gist.github.com/chrismccord/bb1f8b136f5a9e4abc0bfc07b832257e

• Use naive_datetime_usec type to save microseconds of the timestamps (inserted_at and updated_at) in postgres.

• update Readme to fix small typos:

  • add sql command to define password for user
  • update ecto command variable in one of the example (query instead of sub)
  • update link for Behaviour page documentation (hexdoc return a 404)

[codecov[bot]]

Codecov Report

Merging #15 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #15   +/-   ##
=======================================
  Coverage   59.09%   59.09%           
=======================================
  Files           8        8           
  Lines          22       22           
=======================================
  Hits           13       13           
  Misses          9        9

Impacted Files	Coverage Δ
lib/append/address.ex	100% <ø> (ø)	:arrow_up:
lib/append_web/endpoint.ex	50% <ø> (ø)	:arrow_up:

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