Fix echo tab

Fix issue of
```
Adding /Users/cat/projects/Registry to GOPATH...
Checking go project directory structure...
\tcreate src
\tcreate bin
\tcreate pkg
\tcreate doc
\tcreate /Users/cat/projects/Registry/vendor/src
\tcreate /Users/cat/projects/Registry/vendor/bin
\tcreate /Users/cat/projects/Registry/vendor/pkg
\tcreate /Users/cat/projects/Registry/vendor/doc
Done
```