add pymongo to the list of dependencies in README.md

README.md

@@ -32,7 +32,7 @@ Spearmint implements a combination of the algorithms detailed in the following p
 
 **STEP 1: Installation**  
 
-1. Install [python](https://www.python.org/), [numpy](https://www.numpy.org/), [scipy](https://www.numpy.org/). For academic users, the [anaconda](https://continuum.io/downloads) distribution is great. Use numpy 1.8 or higher. We use python 2.7.
+1. Install [python](https://www.python.org/), [numpy](https://www.numpy.org/), [scipy](https://www.numpy.org/), [pymongo](https://api.mongodb.org/python/current/). For academic users, the [anaconda](https://continuum.io/downloads) distribution is great. Use numpy 1.8 or higher. We use python 2.7.
 2. Download/clone the spearmint code  
 3. Install the spearmint package using pip: `pip install -e \</path/to/spearmint/root\>` (the -e means changes will be reflected automatically)  
 4. Download and install MongoDB: https://www.mongodb.org/