Duckduckgo-search

1) add brotli dependency,
2) update USERAGENTS.

1) translate() - migrate to httpx
2) correct usage socks5 proxies
3) random useragent choice
4) text(backend="lite") - normalize title and body
5) update tests
6) cli: create file only after sucsessful response

Migrate from requests to httpx

1. DDGS().text() - add new parameter backend:
api - collect data from duckduckgo.com,
html - collect data from html.duckduckgo.com,
lite - collect data lite.duckduckgo.com.
2. DDGS().text(backend='api') and DDGS().images() - add sleep(0.75) after receiving the vqd.
3. CLI - ddgs text - add -b (--backend) parameter.
4. add tests for DDGS().text(backend='html') and DDGS().text(backend='lite').

DDGS().text() - bugfix in next_page finding

DDGS().text() - parsing html with lxml