Update README.md yet again

README.md

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 # Hydrawise API
 
-This is a client for the [Hydrawise API](docs/Hydrawise REST API). [Hydrawise](https://hydrawise.com) is an internet-controlled home irrigation system.
+This is a client for the [Hydrawise API](docs/Hydrawise%20REST%20API). [Hydrawise](https://hydrawise.com) is an internet-controlled home irrigation system.
 
 On a very basic level, it allows you to do:
 * [Get controllers](#get-controllers)