fix readme rendering which was breaking pypi upload (#936)

* fixed md error which stopped pypi rendering and therefore upload

README.md

@@ -24,42 +24,52 @@ Arctic has been under active development at [Man AHL](https://www.man.com/ahl) s
 
 ### Install Arctic
 
-```
+``
 pip install git+https://github.com/manahl/arctic.git
-```
+``
 
 ### Run a MongoDB
 
-```
+``
 mongod --dbpath <path/to/db_directory>
-```
+``
 
-### Using VersionStore
-
-```
+## Using VersionStore
+``
 from arctic import Arctic
 import quandl
-
-# Connect to Local MONGODB
+``
+### Connect to Local MONGODB
+``
 store = Arctic('localhost')
+``
 
-# Create the library - defaults to VersionStore
+### Create the library - defaults to VersionStore
+``
 store.initialize_library('NASDAQ')
+``
 
-# Access the library
+### Access the library
+``
 library = store['NASDAQ']
+``
 
-# Load some data - maybe from Quandl
+### Load some data - maybe from Quandl
+``
 aapl = quandl.get("WIKI/AAPL", authtoken="your token here")
+``
 
-# Store the data in the library
+### Store the data in the library
+``
 library.write('AAPL', aapl, metadata={'source': 'Quandl'})
+``
 
-# Reading the data
+### Reading the data
+``
 item = library.read('AAPL')
 aapl = item.data
 metadata = item.metadata
-```
+``
 
 VersionStore supports much more: [See the HowTo](howtos/how_to_use_arctic.py)!
 
@@ -88,7 +98,7 @@ itself is composed of a number of collections within the database. Libraries loo
   * user.EOD
   * user.ONEMINUTE
 
-A library is mapped to a Python class.  All library databases in MongoDB are prefixed with 'arctic_'
+A library is mapped to a Python class.  All library databases in MongoDB are prefixed with 'arctic\_'
 
 ### Storage Engines