fix commands

Author: HashNuke

README.md

@@ -12,7 +12,7 @@ Has support for using prebuilt Elixir binaries. Borrows heavily from Gosha Arini
 
 #### To set the buildpack of an existing Heroku app
 
-    heroku config:add BUILDPACK_URL="https://github.com/HashNuke/heroku-elixir-buildpack.git" -a APP_NAME
+    heroku config:add BUILDPACK_URL="https://github.com/HashNuke/heroku-elixir-buildpack.git"
 
 
 #### To set your Elixir and Erlang versions
@@ -24,4 +24,4 @@ Has support for using prebuilt Elixir binaries. Borrows heavily from Gosha Arini
 
 #### Procfile
 
-You can add your own Procfile. If you don't add one, the default profile will run `mix server -p $PORT`.
+You can add your own Procfile. If you don't add one, the default procfile will run `mix server -p $PORT`.