1.3.0.0

* `criterion` was previously reporting the following statistics incorrectly
  on GHC 8.2 and later:

  * `gcStatsBytesAllocated`
  * `gcStatsBytesCopied`
  * `gcStatsGcCpuSeconds`
  * `gcStatsGcWallSeconds`

  This has been fixed.

* The type signature of `runBenchmarkable` has changed from:

  ```haskell
  Benchmarkable -> Int64 -> (a -> a -> a) -> (IO () -> IO a) -> IO a
  ```

  to:

  ```haskell
  Benchmarkable -> Int64 -> (a -> a -> a) -> (Int64 -> IO () -> IO a) -> IO a
  ```

  The extra `Int64` argument represents how many iterations are being timed.

* Remove the deprecated `getGCStats` and `applyGCStats` functions (which have
  been replaced by `getGCStatistics` and `applyGCStatistics`).
* Remove the deprecated `forceGC` field of `Config`, as well as the
  corresponding `--no-gc` command-line option.
* The header in generated JSON output mistakenly used the string `"criterio"`.
  This has been corrected to `"criterion"`.

1.2.6.0

* Add error bars and zoomable navigation to generated HTML report graphs.

  (Note that there have been reports that this feature can be somewhat unruly
  when using macOS and Firefox simultaneously. See
  https://github.com/flot/flot/issues/1554 for more details.)

* Use a predetermined set of cycling colors for benchmark groups in HTML
  reports. This avoids a bug in earlier versions of `criterion` where benchmark
  group colors could be chosen that were almost completely white, which made
  them impossible to distinguish from the background.

1.2.5.0

* Add an `-fembed-data-files` flag. Enabling this option will embed the
  `data-files` from `criterion.cabal` directly into the binary, producing
  a relocatable executable. (This has the downside of increasing the binary
  size significantly, so be warned.)

1.2.4.0

* Fix issue where `--help` would display duplicate options.

1.2.3.0

* Add a `Semigroup` instance for `Outliers`.

* Improve the error messages that are thrown when forcing nonexistent
  benchmark environments.

* Explicitly mark `forceGC` as deprecated. `forceGC` has not had any effect
  for several releases, and it will be removed in the next major `criterion`
  release.

1.2.2.0

* Important bugfix: versions 1.2.0.0 and 1.2.1.0 were incorrectly displaying
  the lower and upper bounds for measured values on HTML reports.

* Have `criterion` emit warnings if suspicious things happen during mustache
  template substitution when creating HTML reports. This can be useful when
  using custom templates with the `--template` flag.

1.2.1.0

* Add `GCStatistics`, `getGCStatistics`, and `applyGCStatistics` to
  `Criterion.Measurement`. These are inteded to replace `GCStats` (which has
  been deprecated in `base` and will be removed in GHC 8.4), as well as
  `getGCStats` and `applyGCStats`, which have also been deprecated and will be
  removed in the next major `criterion` release.

* Add new matchers for the `--match` flag:
  * `--match pattern`, which matches by searching for a given substring in
    benchmark paths.
  * `--match ipattern`, which is like `--match pattern` but case-insensitive.

* Export `Criterion.Main.Options.config`.

* Export `Criterion.toBenchmarkable`, which behaves like the `Benchmarkable`
  constructor did prior to `criterion-1.2.0.0`.

1.2.0.0

* Use `statistics-0.14`.

* Replace the `hastache` dependency with `microstache`.

* Add support for per-run allocation/cleanup of the environment with
  `perRunEnv` and `perRunEnvWithCleanup`,

* Add support for per-batch allocation/cleanup with
  `perBatchEnv` and `perBatchEnvWithCleanup`.

* Add `envWithCleanup`, a variant of `env` with cleanup support.

* Add the `criterion-report` executable, which creates reports from previously
  created JSON files.

1.1.4.0

* Unicode output is now correctly printed on Windows.

* Add Safe Haskell annotations.

* Add `--json` option for writing reports in JSON rather than binary
  format.  Also: various bugfixes related to this.

* Use the `js-jquery` and `js-flot` libraries to substitute in JavaScript code
  into the default HTML report template.

* Use the `code-page` library to ensure that `criterion` prints out Unicode
  characters (like ², which `criterion` uses in reports) in a UTF-8-compatible
  code page on Windows.

* Give an explicit implementation for `get` in the `Binary Regression`
  instance. This should fix sporadic `criterion` failures with older versions
  of `binary`.

* Use `tasty` instead of `test-framework` in the test suites.

* Restore support for 32-bit Intel CPUs.

* Restore build compatibilty with GHC 7.4.

1.1.1.0

* If a benchmark uses `Criterion.env` in a non-lazy way, and you try
  to use `--list` to list benchmark names, you'll now get an
  understandable error message instead of something cryptic.

* We now flush stdout and stderr after printing messages, so that
  output is printed promptly even when piped (e.g. into a pager).

* A new function `runMode` allows custom benchmarking applications to
  run benchmarks with control over the `Mode` used.

* Added support for Linux on non-Intel CPUs.

* This version supports GHC 8.

* The `--only-run` option for benchmarks is renamed to `--iters`.

1.1.0.0

* The dependency on the either package has been dropped in favour of a
  dependency on transformers-compat.  This greatly reduces the number
  of packages criterion depends on.  This shouldn't affect the
  user-visible API.

* The documentation claimed that environments were created only when
  needed, but this wasn't implemented. (gh-76)

* The package now compiles with GHC 7.10.

* On Windows with a non-Unicode code page, printing results used to
  cause a crash.  (gh-55)

1.0.2.0

* Bump lower bound on optparse-applicative to 0.11 to handle yet more
  annoying API churn.

1.0.1.0

* Added a lower bound of 0.10 on the optparse-applicative dependency,
  as there were major API changes between 0.9 and 0.10.