Modified ggmaps section#250

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Mrugankakarte wants to merge 5 commits intojtr13:masterfrom

Mrugankakarte:ggmaps

Commits on Oct 23, 2019

added example for using stamen maps with ggmaps
Mrugankakarte
committed

Commits on Oct 24, 2019

Added ggmap to DESCRIPTION file, uploaded zip file of data instead of csv and deleted the csv file
Mrugankakarte
committed

Commits on Oct 29, 2019