Update to 6.0.0 in master branch

[seisman]

Checklist

• Used a fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

@conda-forge-admin, please rerender

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-webservice.

I tried to re-render for you, but it looks like there was nothing to do.

[seisman]

@conda-forge-admin, please rerender

[seisman]

Currently, this PR builds GMT 6.0.0rc4 on master branch to make sure it works. After 6.0.0 is released, I'll update it to 6.0.0.

[seisman]

@conda-forge-admin, please rerender

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-webservice.

I tried to re-render for you but ran into some issues, please ping conda-forge/core for further assistance.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-webservice.

I tried to re-render for you but ran into some issues, please ping conda-forge/core for further assistance.

[leouieda]

@seisman the README is created automatically from the meta.yml on rerender. That might be what is tripping up the bot.

[leouieda]

Could you try reverting that and rerendering locally?

[seisman]

The README file was modified by previous rerendering. Anyway, I've rerendered it locally and pushed the changes.