Add guard to ensure CAPISTRANO::VERSION is defined #984
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Fixes: #975
Capistrano 2.x doesn't have a
VERSIONconstant. (Instead it has aVersionproperty.) This PR ensures the constant is present before testing its value. If the constant isn't present, no further check is needed since the code path only cares about >= 3.0.There's also some light refactoring for line length and rubocop.