Update README.md

Author: ilyabo

README.md

@@ -18,5 +18,5 @@ You can install the package from GitHub as follows:
 
     locations <- read.csv('https://gist.githubusercontent.com/ilyabo/a7b9701424257146b571149d92a14926/raw/2e9e1e9bcf64cf0090781b451037229ccb78e1b1/locations.csv')
     flows <- read.csv('https://gist.githubusercontent.com/ilyabo/a7b9701424257146b571149d92a14926/raw/2e9e1e9bcf64cf0090781b451037229ccb78e1b1/flows.csv')
-    mapboxAccessToken = 'YOUR_MAPBOX_ACCESS_TOKEN'
+    mapboxAccessToken <- 'YOUR_MAPBOX_ACCESS_TOKEN'
     flowmapblue(locations, flows, mapboxAccessToken, clustering=TRUE, darkMode=TRUE, animation=FALSE)