Release v0.3.13

v0.3.13

• Buildkite now builds the docker images
• Buildkite now runs tests on Linux, under wine, and in the chrome
• Upgrade mruby to 3.2.0 now that it's released
• Platform specific methods now raise a unique error on unsupported platforms
• Add tests for the platform specific methods
• Upload analytics for the web build too
• Add set_texture_filter
• Add generate_texture_mipmaps
• Add Font.filter=
• Add Texture2D.filter=
• Add Texture2D.generate_mipmaps
• Add released?