update package.* to version 4.8.1

package-lock.json

 {
   "name": "fr.irstea.cassiopee",
-  "version": "4.8.0",
+  "version": "4.8.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

package.json

@@ -3,7 +3,7 @@
   "displayName": "Cassiopée",
   "description": "Hydraulic calculators",
   "author": "Irstea",
-  "version": "4.8.0",
+  "version": "4.8.1",
   "main": "main.js",
   "homepage": "http://cassiopee.g-eau.fr",
   "license": "MIT",