Add git sha to itch version

Makefile

@@ -1,4 +1,9 @@
-web/trees:
+VERSION=$(shell git rev-parse --short HEAD)
+
+release/trees/web:
+	cargo build --bin trees --release --target wasm32-unknown-unknown
+
+web/trees: release/trees/web
 	mkdir -p dist/trees
 
 	wasm-bindgen --no-typescript --target web \
@@ -23,5 +28,5 @@ web/trees:
 web/trees/serve: web/trees
 	cd dist/trees && simple-http-server
 
-itch.io/trees:
+itch.io/trees: web/trees
-	butler push dist/trees popgame/trees:html5
+	butler push dist/trees popgame/trees:html5 --userversion=$(VERSION)