docs: update donation badge to reflect April 2026 baseline

[TimeToBuildBob]

Updates the shields.io badge from $201/mo (40 supporters) to ~$275/mo (44 supporters), based on current Open Collective data.

Baseline (Open Collective, 30 days ending 2026-04-30):

• 4 contributions, $274.67 total
• 44 lifetime contributors, $8,465 all-time received

Ref: ErikBjare/bob#336

[greptile-apps]

Greptile Summary

This PR updates the Open Collective donation badge in README.md to reflect the current monthly giving level (~$275/mo from 44 supporters, up from $201/mo from 40 supporters). The URL-encoded shields.io badge string is correctly formed and the figures match the Open Collective baseline cited in the PR description.

Confidence Score: 5/5

Safe to merge — documentation-only change with no code impact.

Single-line badge URL update in README.md. The encoded URL is syntactically correct, the figures align with the Open Collective data provided in the PR description, and there are no functional code changes.

No files require special attention.

Important Files Changed

Filename	Overview
README.md	Single-line update to the shields.io donation badge, bumping displayed amount from $201/mo (40 supporters) to ~$275/mo (44 supporters); change is factually consistent with the PR description's Open Collective data.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Open Collective Data
30-day window ending 2026-04-30] --> B{Badge values}
    B --> C["Amount: ~$275/mo
(was $201/mo)"]
    B --> D["Supporters: 44
(was 40)"]
    C --> E[URL-encoded shields.io badge
budget-~%24275%2Fmo%20from%2044%20supporters]
    D --> E
    E --> F[README.md img src updated]

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