Bump 0.13.0 version

[mdelapenya]

Bump checklist

• [x] VERSION.txt updated with bumped version
• [x] ./features/version.feature test updated with bumped version
• [x] Static files bundled into the Go binary (as shown in ./scripts/bind-assets.sh)
• [x] Update changelog in ./docs/releases.json
• [x] Git commit including the bump
• [x] Git tag using version as tag name
• [x] Git tag pushed to upstream
• [x] Github release created for the tag
• [x] Copy Changelog to Github release
• [x] Binaries generated for the new version
• [x] Binaries uploaded to the proper Github release

[mdelapenya]

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