Update CONTRIBUTING.md

fix git clone example, excluding the protocol results in an error `fatal: repository 'github.com/digitalocean/godo' does not exist`
digitalocean · Sep 30, 2019 · 6127226 · 6127226
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commit 6127226
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -18,7 +18,7 @@ go get -u github.com/stretchr/testify/assert
 If outside `$GOPATH`, just clone the repository:
 
 ```sh
-git clone github.com/digitalocean/godo
+git clone https://github.com/digitalocean/godo
 ```
 
 ## Running tests