Changes since 0.2.0:

API changes to prepare for encode support
OSS-Fuzz integration
Simplified integer reads (Tomasz Kramkowski)
Added option to set custom image width/height limits
All standard chunks are read and validated
Added support for eXIf and oFFs extensions
Added spng_strerror(), spng_version_string()
Added spng_get_*(), spng_set_*() functions for supported chunks
build: libpng is no longer a build dependency, it's only required
        for benchmarks and the testsuite.
build: generate pkg-config file
benchmark: print averaged time over multiple runs
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