Update README.md

Author: armenbeck

README.md

@@ -17,6 +17,8 @@ We recommend installing the necessary packages individualy if running Dedenser f
 * scikit-learn
 * scipy
 * umap-learn
+* plotly
+* dash
 
 ## Installation
 Dedenser can be installed from PyPI with the command:
@@ -210,4 +212,4 @@ Dash is running on http://127.0.0.1:8050/
 ```
 
 The app is then ready to be used in a web browser of choosing:
-![dash](data/dash-app.png)
+![dash](data/dash-app.png)