fix loadBlueprintFile typo

Author: Kelly Selden

src/load-blueprint-file.js

@@ -3,10 +3,10 @@
 const fs = require('fs-extra');
 const path = require('path');
 
-async function loadSafeBlueprintFile(cwd) {
+async function loadBlueprintFile(cwd) {
   try {
     return await fs.readJson(path.join(cwd, 'config/ember-cli-update.json'));
   } catch (err) {}
 }
 
-module.exports = loadSafeBlueprintFile;
+module.exports = loadBlueprintFile;