Add CHANGELOG and edit LiveBook

CHANGELOG.md

@@ -0,0 +1,5 @@
+# Changelog for GuardedStruct 0.0.1
+
+- Detach from the Mishka developer tools library
+- Remove optional libraries (must be enabled by the user)
+- Improvements in some tests

guidance/guarded-struct.livemd

@@ -3,13 +3,14 @@
 ```elixir
 Mix.install([
   {:guarded_struct, "~> 0.0.1"}
-  # Optional dependencies
   {:html_sanitize_ex, "~> 1.4.3"},
+
+  # Optional dependencies, It’s recommended to create your own
+  # custom validation and sanitization functions instead of
+  # enabling these libraries.
   {:email_checker, "~> 0.2.4"},
   {:ex_url, "~> 2.0"},
   {:ex_phone_number, "~> 0.4.3"},
-  {:ecto_sql, "~> 3.11"},
-  {:postgrex, "~> 0.17.2"}
 ])
 ```
 

mix.exs

@@ -45,7 +45,8 @@ defmodule GuardedStruct.MixProject do
       links: %{
         "Mishka" => "https://mishka.tools",
         "GitHub" => @source_url,
-        "Changelog" => "#{@source_url}/blob/master/CHANGELOG.md"
+        "Changelog" => "#{@source_url}/blob/master/CHANGELOG.md",
+        "LiveBook document" => "#{@source_url}/blob/master/guidance/guarded-struct.livemd"
       }
     ]
   end