2.5.5.0
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* Added retrieval of version info and extensions.
* Added extension predicates.
* Added documentation for vector equivalents and aliases.
* Consistently use UTF-8 as the encoding.

2.5.4.0
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* Added documentation for enumerant groups.

2.5.3.0
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* Updated OpenGL registry to r31903.
* Added `GL_EXT_multisampled_compatibility` tokens and functions (gles2 extension only).

2.5.2.1
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* Added CHANGELOG.md to distribution.

2.5.2.0
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* Updated OpenGL registry to r31811.
* Added `ARB_ES3_2_compatibility` extension.
* Added `ARB_gpu_shader_int64` extension.
* Added `ARB_parallel_shader_compile` extension.
* Added `ARB_sample_locations` extension.
* Added `ARB_texture_filter_minmax` extension.
* Added `INTEL_framebuffer_CMAA` extension.
* Added `NV_conservative_raster_dilate` extension.