fix: update the rule-tester import in rule test template (#202)

Fix `rule-tester` import in rule test template

Author: Amnish04

rule/templates/_test.js

@@ -9,7 +9,7 @@
 //------------------------------------------------------------------------------
 
 const rule = require("../../../lib/rules/<%= ruleId %>"),<% if (target === "eslint") { %>
-  RuleTester = require("../../../lib/testers/rule-tester");
+  RuleTester = require("../../../lib/rule-tester");
 <% } else { %>
   RuleTester = require("eslint").RuleTester;
 <% } %>

tests/rule/index.js

@@ -76,7 +76,7 @@ describe("ESLint Rule Generator", () => {
         });
 
         it("has correct rule test file contents", () => {
-            assert.fileContent("tests/lib/rules/no-unused-vars.js", "RuleTester = require(\"../../../lib/testers/rule-tester\");");
+            assert.fileContent("tests/lib/rules/no-unused-vars.js", "RuleTester = require(\"../../../lib/rule-tester\");");
         });
     });