Fix deprecation warning of thor

yujideveloper · yujideveloper · commit 8cce32787805 · 2022-12-06T12:06:17.000+09:00
```
Deprecation warning: Thor exit with status 0 on errors. To keep this behavior, you must define `exit_on_failure?` in `Ec2ssh::CLI`
You can silence deprecations warning by setting the environment variable THOR_SILENCE_DEPRECATION.
```
diff --git a/lib/ec2ssh/cli.rb b/lib/ec2ssh/cli.rb
@@ -114,5 +114,9 @@ def hl
         end
       end
     end
+
+    def self.exit_on_failure?
+      false
+    end
   end
 end

-Original file line number
+Diff line change
         end
       end
     end
++
 +    def self.exit_on_failure?
 +      false
 +    end
   end
 end