docs(readme): fix links to virtualenv docs

Author: ultimateboy

README.md

@@ -76,10 +76,10 @@ Or via your package manager. For example, on Debian Jessie:
 apt-get install python3 python3-dev python3-venv
 ```
 
-With the correct Python in place the quickest way to get up and running is to run `make setup-venv` which will install the Python specific dependencies via [PIP](https://pip.pypa.io/en/stable/) inside an isolated [virtualenv](virtualenv).
+With the correct Python in place the quickest way to get up and running is to run `make setup-venv` which will install the Python specific dependencies via [PIP](https://pip.pypa.io/en/stable/) inside an isolated [virtualenv][virtualenv].
 Running `python --version` to verify the correct version is recommend.
 
-Follow the linked documentation to learn about [virtualenv](virtualenv) and how to `activate` and `deactivate` the environment.
+Follow the linked documentation to learn about [virtualenv][virtualenv] and how to `activate` and `deactivate` the environment.
 
 ## Testing Your Code