Update README (#174)

Fixed typo from old style git clone url

README.md

@@ -137,7 +137,7 @@ Rather than editing files locally, this repository also comes with a web-based c
 development mode with the `web` option (which installs `flask` and `flask-bootstrap`) using:
 
 ```console
-$ git clone git+https://github.com/biopragmatics/biomappings.git
+$ git clone https://github.com/biopragmatics/biomappings.git
 $ cd biomappings
 $ git checkout -b your-branch-name
 $ pip install -e .[web]
@@ -186,7 +186,7 @@ python3 -m pip install git+https://github.com/biopragmatics/biomappings.git
 To install in development mode and create a new branch, use the following:
 
 ```console
-$ git clone git+https://github.com/biopragmatics/biomappings.git
+$ git clone https://github.com/biopragmatics/biomappings.git
 $ cd biomappings
 $ python3 -m pip install -e .
 ```