(maint) clean up a few off-by-one errors

Upper bounds should not include the `.0` release when comparing

Author: DavidS

Gemfile

@@ -18,7 +18,7 @@ group :tests do
   # these require special dependencies to have everything load properly
 
   # `codecov` 0.1.17 introduced usage of %i[] which is not recognised by JRuby 1.7
-  if RUBY_PLATFORM == 'java' && Gem::Version.new(RUBY_VERSION) <= Gem::Version.new('2.3.0')
+  if RUBY_PLATFORM == 'java' && Gem::Version.new(RUBY_VERSION) < Gem::Version.new('2.3.0')
     gem 'codecov', '= 0.1.16'
   else
     gem 'codecov'
@@ -50,9 +50,9 @@ group :tests do
   end
 
   # JRuby 1.7 does not like json 2.3.0, jruby 9.1.9.0 has RUBY_VERSION == '2.3.3'
-  gem 'json', '2.2.0' if RUBY_PLATFORM == 'java' && Gem::Version.new(RUBY_VERSION) <= Gem::Version.new('2.3.0')
+  gem 'json', '2.2.0' if RUBY_PLATFORM == 'java' && Gem::Version.new(RUBY_VERSION) < Gem::Version.new('2.3.0')
   # the last version of parallel to support ruby 2.1
-  gem 'parallel', '1.13.0' if Gem::Version.new(RUBY_VERSION) <= Gem::Version.new('2.2.0')
+  gem 'parallel', '1.13.0' if Gem::Version.new(RUBY_VERSION) < Gem::Version.new('2.2.0')
 
   # license_finder does not install on windows using older versions of rubygems.
   # ruby 2.4 is confirmed working on appveyor and we only need to run it on the newest gemset anyways