Eslinting for fetch API

assets/.eslintrc

@@ -46,6 +46,8 @@
     "Math": true,
     "process": true,
     "XMLHttpRequest": true,
-    "window": true
+    "window": true,
+    "fetch": true,
+    "Request": true
   }
 }

assets/src/scripts/web-services/instantaneous-values.js

@@ -91,10 +91,10 @@ export const fetchNewTimeSeries = async function({siteno, parameterCode=null, pe
         }),
         {
             cache: 'no-store'
-        })
+        });
     try {
         const response = await fetch(request, {
-            method: 'GET',
+            method: 'GET'
         });
         if (response.status === 200) {
             return await response.json();