add a changelog

CHANGELOG.md

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+### v1.6.2
+
+#### Fixes
+
+- revert 1.6.1 for now
+
+### v1.6.1
+
+#### Fixes
+
+- fixes sometimes incorrect num on Android/ARM Linux (#45)
+
+## v1.6.0
+
+#### Features
+
+- `get_physical` gains Windows support
+
+### v1.5.1
+
+#### Fixes
+
+- fix `get` to return 1 if `sysconf(_SC_NPROCESSORS_ONLN)` failed
+
+## v1.5.0
+
+#### Features
+
+- `get()` now checks `sched_affinity` on Linux
+
+## v1.4.0
+
+#### Features
+
+- add `haiku` target support
+
+## v1.3.0
+
+#### Features
+
+- add `redox` target support
+
+### v1.2.1
+
+#### Fixes
+
+- fixes `get_physical` count (454ff1b)
+
+## v1.2.0
+
+#### Features
+
+- add `emscripten` target support
+- add `fuchsia` target support
+
+## v1.1.0
+
+#### Features
+
+- added `get_physical` function to return number of physical CPUs found
+
+# v1.0.0
+
+#### Features
+
+- `get` function returns number of CPUs (physical and virtual) of current platform