Support perl down to 5.8.1

[ilmari]

This module is used by Devel::Cover::Report::Codecov, which would
otherwise work on 5.8.1.

[coveralls]

Coverage increased (+0.3%) to 84.79% when pulling 8487b20 on ilmari:perl-5.8 into 71246ef on powerman:master.

[coveralls]

Coverage increased (+0.3%) to 84.79% when pulling cf9daea on ilmari:perl-5.8 into 71246ef on powerman:master.

[coveralls]

Coverage increased (+0.3%) to 84.79% when pulling ce35993 on ilmari:perl-5.8 into 71246ef on powerman:master.

[powerman]

Looks like it's a bit too early for PR - Travis fails. Ping me when you'll finish with it, please.

[coveralls]

Coverage increased (+0.3%) to 84.839% when pulling d6dc31a on ilmari:perl-5.8 into 71246ef on powerman:master.

[ilmari]

Sorry, I messed up adjusting .travis.yml, should be fixed now.

The only failure in the latest build is because a networking glitch, you might want to try restarting https://travis-ci.org/powerman/perl-Test-Mock-Time/jobs/326877393.

[ilmari]

The warnings from the tests on 5.8 are harmless, but can be silenced by bumping the Time::HiRes dependency to 1.9724.

[powerman]

@ilmari Is it possible to somehow address issue with warning Prototype mismatch: sub Time::HiRes::clock_nanosleep ($$;$) vs () at /home/travis/perl5/perlbrew/perls/5.8/lib/site_perl/5.8.8/Test/MockModule.pm line 154 during global destruction. on 5.8? If every script running on 5.8 will have this warning on exit, then this doesn't looks good enough to me.

[powerman]

@ilmari Oh, sorry, just noticed you've already answered this.

[powerman]

v0.1.7 just released. Thanks!