Work around Anthropic rate limits

[maxwelljoslyn]

According to the docs for Aider:

Anthropic has very low rate limits. You can access all the Anthropic models via OpenRouter without rate limits. For example: aider --model openrouter/anthropic/claude-3.5-sonnet

I haven't had to worry about the rate limit as of my last round of heavy usage, roughly June 2024. But if I do, this workaround is something to keep in mind.