v0.18.3

Small bugfix release. It's especially recommended to upgrade simplecov-html as well because of bugs in the 0.12.0 release.

Bugfixes

• Fix a regression related to file encodings as special characters were missing. Furthermore we now respect the magic # encoding: ... comment and read files in the right encoding. Thanks (@Tietew) - see #866
• Use Minitest.after_run hook to trigger post-run hooks if Minitest is present. See #756 and #855 thanks (@adam12)