chore: use const in benchmark and tests

Author: aminya

benchmark/benchmark.js

@@ -29,7 +29,7 @@ testutils.doFilterTest("~98% of results + Fuzzy match, [Worst case but shorter s
 
 const query = "index"
 testutils.start_timer()
-prepared = fuzzaldrinPlus.prepareQuery(query)
+const prepared = fuzzaldrinPlus.prepareQuery(query)
 for (const line of lines) {
   fuzzaldrinPlus.match(line, query, {
     preparedQuery: prepared,

spec/filter-tree-spec.js

@@ -3,7 +3,7 @@ const DeepEqual = require("deep-equal")
 
 describe("filterTree", () => {
   it("can fuzzy search in an array tree objects", () => {
-    candidates = [
+    const candidates = [
       { data: "bye1", children: [{ data: "hello" }] },
       { data: "Bye2", children: [{ data: "_bye4" }, { data: "hel" }] },
       { data: "eye" },