Docs: update README and docs with v0.5.0 (#875)

* Updated version in README

* Updated docs with new version

Author: kraleppa

README.md

@@ -33,7 +33,7 @@ Add `live_debugger` to your list of dependencies in `mix.exs`:
 ```elixir
   defp deps do
     [
-      {:live_debugger, "~> 0.4.0", only: :dev}
+      {:live_debugger, "~> 0.5.0", only: :dev}
     ]
   end
 ```

docs/welcome.md

@@ -35,7 +35,7 @@ Add `live_debugger` to your list of dependencies in `mix.exs`:
 ```elixir
   defp deps do
     [
-      {:live_debugger, "~> 0.4.0", only: :dev}
+      {:live_debugger, "~> 0.5.0", only: :dev}
     ]
   end
 ```