task: build require.js test fixture with [].join instead of str replace

Author: etpinard

tasks/pretest.js

@@ -55,9 +55,13 @@ function makeTestImageFolders() {
 
 // Make script file that define plotly in a RequireJS context
 function makeRequireJSFixture() {
-    var bundle = fs.readFileSync(constants.pathToPlotlyDistMin, 'utf-8'),
-        template = 'define(\'plotly\', function(require, exports, module) { {{bundle}} });',
-        index = template.replace('{{bundle}}', bundle);
+    var bundle = fs.readFileSync(constants.pathToPlotlyDistMin, 'utf-8');
+
+    var index = [
+        'define(\'plotly\', function(require, exports, module) {',
+        bundle,
+        '});'
+    ].join('');
 
     common.writeFile(constants.pathToRequireJSFixture, index);
     logger('make build/requirejs_fixture.js');