Method is not working due to headers

As we can find in TeamCity documentation there is specific method to get/update some project paramteres:

> Project name/description/archived status: GET/PUT http://teamcity:8111/app/rest/projects// (accepts/produces text/plain) where is one of "name", "description", "archived".

It accepts only `text/plain` headers that's why it's not really easy to use this method with current version of client.

```
def set_description(tc, locator, description):
old_default_headers = tc.default_headers.copy()
tc.set_default_header(header_name='Content-type', header_value='text/plain')
tc.set_default_header(header_name='Accept', header_value='text/plain')

result = tc.projects.set_project_filed(project_locator=locator, field='description',
body=description)

tc.default_headers = old_default_headers.copy()
del (old_default_headers)
```

Probably, this method should be updated and this kind of issues with specific headers also handled by client.

Start at the projects.set_project_filed method and inspect how the client builds request headers for the TeamCity project field endpoint. Confirm how text/plain Accept and Content-type headers should be handled, then verify that updating a project field works without requiring callers to replace the client's default headers.

Written by the indexing model from the issue text.