v0.4

New features:

• asv check command for a quick check of benchmark suite validity. (#782)
• asv run HASHFILE:filename can read commit hashes to run from file or stdin (#768)
• --set-commit-hash option to asv run, which allows recording results from runs in "existing" environments not managed by asv (#794)
• --cpu-affinity option to asv run and others, to set CPU affinity (#769)
• "Hide legend" option in web UI (#807)
• pretty_source benchmark attribute for customizing source code shown (#810)
• Record number of cores in machine information (#761)

API Changes:

• Default timer changed from process_time() to timeit.default_timer() to fix resolution issues on Windows. Old behavior can be restored by setting Benchmark.timer = time.process_time (#780)

Bug Fixes:

• Fix pip command line in install_command (#806)
• Python 3.8 compatibility (#814)
• Minor fixes and improvements (#759, #764, #767, #772, #779, #783, #784, #787, #790, #795, #799, #804, #812, #813, #815, #816, #817, #818, #820)