feature/cache: Rename LruCache

Author: Intellicode

src/__snapshots__/lru-cache.spec.js.snap

@@ -1,7 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`Lru .constructor() constructs the cache properly 1`] = `
-LRU {
+LruCache {
   "cache": LRUCache {
     Symbol(max): 10,
     Symbol(lengthCalculator): [Function],

src/lru-cache.js

@@ -1,6 +1,6 @@
 const lru = require('lru-cache');
 
-module.exports = class LRU {
+module.exports = class LruCache {
   constructor({ maxItems }) {
     this.cache = lru(maxItems);
   }