Added features for improved research quality

[assafelovic]

We're excited to announce the latest release of GPT Researcher! This release includes an addition of various and powerful search engines for improved overall research quality and experience.

1. Tavily API - An LLM focused search engine for optimized, explicit and factual results. It's free of use (!)
2. Serp API - Requires paid account
3. Google search API - Requires paid account
4. Searx - Meta search engine.

In addition, this release includes additional performance improvements and bug fixes.

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