Rename fake_timers.js to fake-timers.js

This project uses kebab-case for .js filenames

lib/sinon.js

@@ -4,7 +4,7 @@ var behavior = require("./sinon/behavior");
 var createSandbox = require("./sinon/create-sandbox");
 var deprecated = require("./sinon/util/core/deprecated");
 var extend = require("./sinon/util/core/extend");
-var fakeTimers = require("./sinon/util/fake_timers");
+var fakeTimers = require("./sinon/util/fake-timers");
 var format = require("./sinon/util/core/format");
 var nise = require("nise");
 var Sandbox = require("./sinon/sandbox");

lib/sinon/sandbox.js

@@ -8,7 +8,7 @@ var isPropertyConfigurable = require("./util/core/is-property-configurable");
 var isNonExistentOwnProperty = require("./util/core/is-non-existent-own-property");
 var sinonMatch = require("./match");
 var sinonAssert = require("./assert");
-var sinonClock = require("./util/fake_timers");
+var sinonClock = require("./util/fake-timers");
 var sinonMock = require("./mock");
 var sinonSpy = require("./spy");
 var sinonStub = require("./stub");

test/sandbox-test.js

@@ -16,7 +16,7 @@ var sinonStub = require("../lib/sinon/stub");
 var sinonConfig = require("../lib/sinon/util/core/get-config");
 var sinonMatch = require("../lib/sinon/match");
 var sinonAssert = require("../lib/sinon/assert");
-var sinonClock = require("../lib/sinon/util/fake_timers");
+var sinonClock = require("../lib/sinon/util/fake-timers");
 
 var supportsAjax = typeof XMLHttpRequest !== "undefined" || typeof ActiveXObject !== "undefined";
 var supportPromise = Boolean(global.Promise);

test/util/fake-timers-test.js

@@ -1,7 +1,7 @@
 "use strict";
 
 var referee = require("@sinonjs/referee");
-var fakeTimers = require("../../lib/sinon/util/fake_timers");
+var fakeTimers = require("../../lib/sinon/util/fake-timers");
 var sinonStub = require("../../lib/sinon/stub");
 var sinonSpy = require("../../lib/sinon/spy");