Lock thor version
Lock thor version

This prevents annoying messages during test setup like:

```
Expected string default value for '--helper'; got true (boolean)
Expected string default value for '--assets'; got true (boolean)
Expected string default value for '--decorator'; got true (boolean)
Expected string default value for '--decorator'; got true (boolean)
```

siutin/activeadmin,cmunozgar/activeadmin,cmunozgar/activeadmin,SoftSwiss/active_admin,mrjman/activeadmin,deivid-rodriguez/activeadmin,activeadmin/activeadmin,javierjulio/activeadmin,siutin/activeadmin,javierjulio/activeadmin,varyonic/activeadmin,SoftSwiss/active_admin,mauriciopasquier/active_admin,waymondo/active_admin,siutin/activeadmin,wspurgin/activeadmin,activeadmin/activeadmin,vytenis-s/activeadmin,mauriciopasquier/active_admin,cmunozgar/activeadmin,gogovan/activeadmin,vraravam/activeadmin,maysam/activeadmin,activeadmin/activeadmin,deivid-rodriguez/activeadmin,gogovan/activeadmin,gogovan/activeadmin,wspurgin/activeadmin,waymondo/active_admin,deivid-rodriguez/activeadmin,vytenis-s/activeadmin,maysam/activeadmin,maysam/activeadmin,mrjman/activeadmin,mrjman/activeadmin,varyonic/activeadmin,varyonic/activeadmin,wspurgin/activeadmin,vraravam/activeadmin,mauriciopasquier/active_admin,vraravam/activeadmin,javierjulio/activeadmin,waymondo/active_admin,vytenis-s/activeadmin,SoftSwiss/active_admin