Update README.md

Author: trevorgerhardt

README.md

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 # osm.ts
-OpenStreetMap reader, writer, and merge tool. Written in TypeScript.
+Read, inspect, and write OpenStreetMap PBFs in the browser. 
+
+## Library
 
 ## Features
 - [Native Decompression and Compression](https://developer.mozilla.org/en-US/docs/Web/API/Compression_Streams_API)
 - [@mapbox/pbf](https://github.com/mapbox/pbf) for decoding and encoding protocol buffers.
 - TypeScript.
 - Low-level stream reading and writing functions for usage with larger datasets.
-- Convert entities to GeoJSON.
+- Generate "OSM Changeset"-like patches between two PBFs.
+- Merge OSM PBFs.
+
+## Inspector
+...
+
+## Merge Tool 
+One [application](https://conveyal.github.io/osm.ts/merge) of the osm.ts library is a tool that enables merging two OSM PBF files.
+
+