Add FLHI manufacturer (#314)

Manufacturers.md

@@ -39,6 +39,7 @@ This is the official list of manufacturer ids (`manufacturer_id` in the target c
 |FFRC|FlyFishRC|https://www.flyfish-rc.com/|
 |FLAO|FLAO Limited|https://www.sunrisemodel.com|
 |FLCO|Shenzhen Flycolor Electronic Co., LTD|http://www.flycolor.net/|
+[FLHI|Fly High|https://elektronchika.github.io/flyhigh/|
 |FLLF|Flying Lemon FPV|https://github.com/flyinglemonfpv|
 |FLMO|FlyMod|https://flymod.net/|
 |FLON|FlightOne|https://flightone.com/|