Add badges to README.md

Add CRAN package link badge, downloads/month badge, and TravisCI build badge
2019-04-25 07:54:18 -07:00 · 2019-04-25 07:54:18 -07:00 · 51a32900a8
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+[![CRAN](https://www.r-pkg.org/badges/version/AzureKusto)](https://cran.r-project.org/package=AzureKusto)
+![Downloads](https://cranlogs.r-pkg.org/badges/AzureKusto)
+[![Travis Build Status](https://travis-ci.org/cloudyr/AzureKusto.png?branch=master)](https://travis-ci.org/cloudyr/AzureKusto)
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 # AzureKusto

 R interface to Kusto, also known as [Azure Data Explorer](https://azure.microsoft.com/en-us/services/data-explorer/), a fast and highly scalable data exploration service.