feat(genBase): show raw stdout for yo check (angular-fullstack#1944)

show raw stdout if yo >= 1.7.1 check fails

Author: Awk34

Diff for: src/generators/generator-base.js

@@ -18,7 +18,8 @@ export function genBase(self) {
   if(!process.env.CI) {
     yoCheckPromise = genUtils.runCmd('yo --version').then(stdout => {
       if(!semver.satisfies(semver.clean(stdout), '>= 1.7.1')) {
-        throw new Error('ERROR: You need to update yo to at least 1.7.1 (npm i -g yo)');
+        throw new Error(`ERROR: You need to update yo to at least 1.7.1 (npm i -g yo)
+'yo --version' output: ${stdout}`);
       }
     });
   } else {