Update README.md (#4427)

Co-authored-by: Sang Ik Lee <sang.ik.lee@intel.com>
Co-authored-by: Scott Cyphers <diyessi@users.noreply.github.com>

README.md

@@ -29,8 +29,7 @@ The Python wheels for nGraph have been tested and are supported on the following
 
 To install via pip, run: 
 
-```python
-
+```
 pip install --upgrade pip==19.3.1
 pip install ngraph-core
 ```