Support for full project tree

[liyaka]

The tools works fine on a specific folder that has tests, but when running with ./...
it fails with:
#13 0.848 ? github.com/xxx/fff/controller/auth [no test files] #13 1.027 # github.com/xxx/fff/controller/config #13 1.027 controller/config/config.go:84:3: Fatal call has possible formatting directive %v #13 1.035 error: exit status 2 #13 1.037 panic: EOF

There are indeed folders without tests, but I expect them to be ignored...