fix: Reject with json if request fails with json (#984)

* fix: Reject with json if request fails with json

* handle not json case

* refactor

* Update package.json

Author: ChaituVR

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@snapshot-labs/snapshot.js",
-  "version": "0.11.14",
+  "version": "0.11.15",
   "repository": "snapshot-labs/snapshot.js",
   "license": "MIT",
   "main": "dist/snapshot.cjs.js",

src/sign/index.ts

@@ -107,9 +107,11 @@ export default class Client {
       fetch(address, init)
         .then((res) => {
           if (res.ok) return resolve(res.json());
+          if (res.headers.get('content-type')?.includes('application/json'))
+            return res.json().then(reject).catch(reject);
           throw res;
         })
-        .catch((e) => reject(e));
+        .catch(reject);
     });
   }