DOC Remove cugraph from README

README.md

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 * `cuml`: contains four example notebooks showing the usage of different machine learning algorithms included in cuML: `knn`, `dbscan`, `pca` and `tsvd`. It also includes a small subset of the Mortgage Dataset used in the notebooks.
 * `mortgage`: contains the notebook which runs ETL + ML on the Mortgage Dataset derived from [Fannie Mae’s Single-Family Loan Performance Data](http://www.fanniemae.com/portal/funding-the-market/data/loan-performance-data.html) ... download the mortgage dataset for use with the notebook [here](https://rapidsai.github.io/demos/datasets/mortgage-data)
-* `cugraph`: contains eight example notebooks showing the usage of different graph analytics algortihms included in cuGraph: `BFS`, `Jaccard Similarity`, `Weighted Jaccard`, `Louvain`, `Page Rank`, two examples of `Spectral Clustering`, and `Single Source Shortest Path` 
 * `utils`: contains a set of useful scripts for interacting with RAPIDS