PR: Update to Phoenix 1.5.3 and LiveView 0.13.2 issue #17

[nelsonic]

As the title of the PR suggests this Pull Requests contains:

• Update to the latest version of Phoenix & LiveView Update to Phoenix v1.5.3 and LiveView v0.13.2 #17 ⬆️
• Updates to the README.md to reflect new (simplified) setup process. 📝

[codecov]

Codecov Report

Merging #18 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #18   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         3    +1     
  Lines            8        12    +4     
=========================================
+ Hits             8        12    +4     

Impacted Files	Coverage Δ
lib/live_view_counter_web/live/counter.ex	100.00% <100.00%> (ø)
lib/live_view_counter_web/telemetry.ex	100.00% <100.00%> (ø)

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[nelsonic]

Build failing due to diverged dependencies:

Dependencies have diverged:
* plug (Hex package)
  the dependency plug 1.9.0
  > In deps/plug_cowboy/mix.exs:
    {:plug, "~> 1.7", [env: :prod, hex: "plug", repo: "hexpm", optional: false]}
  does not match the requirement specified
  > In deps/phoenix/mix.exs:
    {:plug, "~> 1.10", [env: :prod, hex: "plug", repo: "hexpm", optional: false]}
  Ensure they match or specify one of the above in your deps and set "override: true"
* plug_cowboy (Hex package)
  the dependency plug_cowboy 2.1.2
  > In mix.exs:
    {:plug_cowboy, "~> 2.0", [env: :prod, repo: "hexpm", hex: "plug_cowboy"]}
  does not match the requirement specified
  > In deps/phoenix/mix.exs:
    {:plug_cowboy, "~> 1.0 or ~> 2.2", 
  [env: :prod, hex: "plug_cowboy", repo: "hexpm", optional: true]}
  Ensure they match or specify one of the above in your deps and set "override: true"
** (Mix) Can't continue due to errors on dependencies
The command "mix deps.get" failed and exited with 1 during .
Your build has been stopped.

https://travis-ci.com/github/dwyl/phoenix-liveview-counter-tutorial/builds/168954882#L263

[nelsonic]

This PR is only big because I recreated the App from scratch so there's a bunch of Phoenix boilerplate and package-lock.json 🙄
In actual fact the README.md was significantly reduced! That's a great thing because the tutorial is streamlined and more beginner friendly. 🎉

[SimonLab]

Just two small suggestions otherwise looks good 👍

[nelsonic]

@SimonLab thanks for fixing those two issues. 👍

[nelsonic]

@SimonLab thanks! 🙌