add testing section to readme.md (#92)

Signed-off-by: Daniel Maricic <[email protected]>

Author: woss

README.md

@@ -17,11 +17,11 @@
 ## Table of Contents
 
 - [Usage](#usage)
+- [Testing](#testing)
 - [Maintainers](#maintainers)
 - [Contribute](#contribute)
 - [License](#license)
 
-
 ## Usage
 
 ```rust
@@ -59,6 +59,10 @@ cid = "0.7.0"
 
 You can also run this example from this checkout with `cargo run --example readme`.
 
+## Testing
+
+You can run the tests using this command: `cargo test --all-features`
+
 ## Maintainers
 
 Captain: [@dignifiedquire](https://github.com/dignifiedquire).
@@ -71,7 +75,6 @@ Check out our [contributing document](https://github.com/multiformats/multiforma
 
 Small note: If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
 
-
 ## License
 
 [MIT](LICENSE) © 2017 Friedel Ziegelmayer