Add example of delayed $touch

docs/partials/examples/ExampleDelayedTouch.vue

@@ -0,0 +1,44 @@
+<template lang="pug">
+  div
+    .form-group(v-bind:class="{ 'form-group--error': $v.name.$error }")
+      label.form__label Name
+      input.form__input(v-model.trim="name" @input="delayTouch($v.name)")
+    span.form-group__message(v-if="!$v.name.required") Field is required
+    span.form-group__message(v-if="!$v.name.minLength")
+      | Name must have at least {{$v.name.$params.minLength.min}} letters.
+    span.form-group__message(v-if="!$v.name.maxLength")
+      | Name must have at most {{$v.name.$params.maxLength.max}} letters.
+
+    pre
+      | name: {{ $v.name }}
+</template>
+
+<script>
+import { required, minLength, maxLength } from 'vuelidate/lib/validators'
+
+const touchMap = new WeakMap()
+
+export default {
+  data () {
+    return {
+      name: ''
+    }
+  },
+  validations: {
+    name: {
+      required,
+      minLength: minLength(4),
+      maxLength: maxLength(15)
+    }
+  },
+  methods: {
+    delayTouch ($v) {
+      $v.$reset()
+      if (touchMap.has($v)) {
+        clearTimeout(touchMap.get($v))
+      }
+      touchMap.set($v, setTimeout($v.$touch, 1000))
+    }
+  }
+}
+</script>

docs/partials/examples/_examples.pug

@@ -55,3 +55,11 @@
               return Boolean(await response.json())
             }
           }
+
+  +subsection('Delayed validation errors')
+    p.typo__p
+      | You can do anything you need with the $touch state, no matter how fancy your requirements are.
+      | It all boils down to calling $touch and $reset in the right moment. As an example of that,
+      | here is an easy to follow implementation of delayed error based on custom <kbd>setTimeout</kbd> logic.
+      | It triggers one second after last input.
+    +example('ExampleDelayedTouch')

docs/partials/examples/index.js

@@ -1,5 +1,6 @@
 export ExampleAsync from './ExampleAsync'
 export ExampleBasic from './ExampleBasic'
+export ExampleDelayedTouch from './ExampleDelayedTouch'
 export ExampleEachArray from './ExampleEachArray'
 export ExampleNested from './ExampleNested'
 export ExampleRepeatPassword from './ExampleRepeatPassword'