Update lib to work with dynamic value prop. Update spec and readme to accomodate for changes

example/app.vue

@@ -1,21 +0,0 @@
-<template>
-  <input type="text" v-input-autosize v-model="foo" placeholder="A placeholder" />
-</template>
-<script>
-  import Vue from "vue";
-  import VueInputAutosize from "../";
-
-  Vue.use(VueInputAutosize);
-
-  export default {
-    name: "app",
-    ready(){
-      console.log("Ready!")
-    },
-    data(){
-      return {
-        foo: "Hello"
-      }
-    }
-  }
-</script>

example/index.js

@@ -1,6 +0,0 @@
-import Vue from "vue";
-import app from "./app";
-new Vue({
-  el: "body",
-  components: { app }
-})