do not mention CDs/USBs, Internet Explorer -> Edge

fixes hotosm#646

_posts/en/1900-12-21-start-josm_en.md

@@ -17,8 +17,7 @@ How to download and install JOSM, the Java OpenStreetMap editor, change some of
 Download JOSM
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--   If you have a copy of JOSM on a CD or usb flash drive, you can skip to the next section, Install JOSM.
--   If you don’t have JOSM already, or want the newest version, open your web browser - this may be Firefox, Chrome, Opera, or Internet Explorer.
+-   If you don’t have JOSM already, or want the newest version, open your web browser - this may be Firefox, Chrome, Opera, or Edge.
 -   In the address bar at the top of the window, enter the following text and press Enter: [josm.openstreetmap.de](http://josm.openstreetmap.de)
 -   You can also find the JOSM website by searching the internet for “JOSM”.
 -   The website should look something like this: