Simplify builds by removing Hash::Merge

[petdance]

Hash::Merge is used in only one place, in t/01-detect.t. It's used to combine two hashrefs:

my $all_tests = merge( $tests, $more_tests );

However, there is no overlap between $tests and $more_tests, so Hash::Merge isn't necessary, and could just be:

my $all_tests = { %$tests, %$more_tests };

This was prompted by HTTP::BrowserDetect not installing for me in a Docker container build. Hash::Merge fails to install. I know that the failure of Hash::Merge isn't HTTP::BrowserDetect's problem, but I figure simplifying its module usage could be a good thing.

[petdance]

Nice, thank you.

[oalders]

Should be on CPAN shortly.