Update install.sh

Update changes to follow upstream org change.

install.sh

@@ -66,7 +66,7 @@ __atuin_install_arch(){
 __atuin_install_ubuntu(){
 	if [ "$(dpkg --print-architecture)" = "amd64" ]; then
 		echo "Ubuntu detected"
-		ARTIFACT_URL="https://github.com/ellie/atuin/releases/download/$LATEST_VERSION/atuin_${LATEST_VERSION//v/}_amd64.deb"
+		ARTIFACT_URL="https://github.com/atuinsh/atuin/releases/download/$LATEST_VERSION/atuin_${LATEST_VERSION//v/}_amd64.deb"
 
 		TEMP_DEB="$(mktemp)".deb &&
 		curl -Lo "$TEMP_DEB" "$ARTIFACT_URL"
@@ -153,7 +153,7 @@ __atuin_install_cargo(){
 
 __atuin_install_unsupported(){
 	echo "Unknown or unsupported OS or architecture"
-	echo "Please check the README at https://github.com/ellie/atuin for manual install instructions"
+	echo "Please check the README at https://github.com/atuinsh/atuin for manual install instructions"
 	echo "If you have any problems, please open an issue!"
 
 	while true; do