Update update.sh, use Alpine v3.7 for node.js >= v10

Author: PeterDaveHello

update.sh

@@ -45,7 +45,10 @@ function update_node_version {
 		sed -E -i.bak 's/^FROM (.*)/FROM '"$fromprefix"'\1/' "$dockerfile" && rm "$dockerfile".bak
 		sed -E -i.bak 's/^(ENV NODE_VERSION |FROM .*node:).*/\1'"$version.${fullVersion:-0}"'/' "$dockerfile" && rm "$dockerfile".bak
 		sed -E -i.bak 's/^(ENV YARN_VERSION ).*/\1'"$yarnVersion"'/' "$dockerfile" && rm "$dockerfile".bak
-		if [[ "${version/.*/}" -ge 8 || "$arch" = "ppc64le" || "$arch" = "s390x" || "$arch" = "arm64" || "$arch" = "arm32v7" ]]; then
+		if [[ "${version/.*/}" -ge 10 ]]; then
+			sed -E -i.bak 's/FROM (.*)alpine:3.4/FROM \1alpine:3.7/' "$dockerfile"
+			rm "$dockerfile.bak"
+		elif [[ "${version/.*/}" -ge 8 || "$arch" = "ppc64le" || "$arch" = "s390x" || "$arch" = "arm64" || "$arch" = "arm32v7" ]]; then
 			sed -E -i.bak 's/FROM (.*)alpine:3.4/FROM \1alpine:3.6/' "$dockerfile"
 			rm "$dockerfile.bak"
 		fi