fixed typo in build.sh

build.sh

@@ -30,11 +30,11 @@ main() {
             echo -e "$Red### You are not in root$reset"
             exit 1
         else
-	    change_mirror
             install
             echo -e "$Blue### Install complete ###$reset"
             echo -e "$Green### Start build $reponame with archiso ###$reset"
-            build
+            change_mirror
+	    build
         fi
     else
         echo -e "$Red###OS can't supported###$reset"