feat: show snapshot name in error message

README.md

@@ -45,9 +45,9 @@ describe('focused input field', () => {
     cy.visit('http://todomvc.com/examples/react/')
     cy
       .focused()
-      .snapshot('initial')
+      .snapshot({ name: 'initial' })
       .type('eat healthy breakfast')
-      .snapshot('after typing')
+      .snapshot({ name: 'after typing' })
   })
 })
 ```

src/index.js

@@ -158,7 +158,7 @@ function registerCypressSnapshot () {
         devToolsLog.expected = expected
         delete devToolsLog.value
         devToolsLog.value = value
-        throw new Error(`Snapshot difference. To update, delete snapshot and rerun test.\n${json.message}`)
+        throw new Error(`Snapshot "${name}" difference. To update, delete snapshot and rerun test.\n${json.message}`)
       })
     }