readme: update installation

README.md

@@ -4,18 +4,11 @@ Elixir library implementing the [Logpoint API reference](https://docs.logpoint.c
 
 ## Installation
 
-If [available in Hex](https://hex.pm/docs/publish), the package can be installed
-by adding `logpoint_api` to your list of dependencies in `mix.exs`:
-
 ```elixir
 def deps do
   [
-    {:logpoint_api, "~> 0.1.0"}
+    {:logpoint_api, github: "MikaelFangel/logpoint_api", tag: "v0.1.0"}
   ]
 end
 ```
 
-Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
-and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
-be found at <https://hexdocs.pm/logpoint_api>.
-