Merge pull request #1010 from devloglogan/typo_fix

fix typo in Mix chapter reading

reading/mix.livemd

@@ -324,7 +324,7 @@ on HexDocs. Sometimes removing the `_build` folder and recompiling a project can
 
 Other developers create open-source Elixir projects hosted on GitHub, which we can add as dependencies to our project.
 
-There is a massive ecosystem of Elixir projects to that you don't have to
+There is a massive ecosystem of Elixir projects, which means you don't have to
 reinvent the wheel and solve already solved problems. The [Hex.pm](https://hex.pm/) contains a list of available Elixir projects you may find useful. For a curated list, check out the [awesome-elixir](https://github.com/h4cc/awesome-elixir) project.
 
 To install a dependency, include the name of the project and desired version in a tuple inside the `deps/0` function