Add Ruby 3.1 support that is backwards compatible to Ruby 1.9.3 #74
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YAML.safe_loadwith keyword arguments is available since Psych 3.1 [https://github.com/ruby/psych/pull/358, https://github.com/ruby/psych/pull/378], but keyword arguments are mandatory since Psych 4.0 [3].This is a backwards compatible version of #73. Using docker images, I was able to test this works back to Ruby 1.9.3 (probably before that, I just can't build Ruby < 2 on my machine and Ruby 1.9.3 is the only official Docker image).
Fixes #72