[release] 1.0.0 🎉 (stable)

[eonu]

Major changes

• Change Query connective instance methods (#38):
  • #& -> #and
  • #| -> #or
  • #! -> #and_not
• Split version number from paper identifier in Paper (add version key-word argument to #id and #url, and add #version). (#39)
• Add Cleaner.extract_id and Cleaner.extract_version. (#39)
• Make Query#add_connective always return self. (#40)
• Redefine Arx.search to user Paper.parse's search key-word argument. (#40)
• Implement all tests. (#40)

Minor changes

• Change declared regular expression literals from %r"" to standard //. (#39)
• Remove #extract_id from Query and use Cleaner.extract_id instead. (#39)
• Redefine Paper#revision? to use the new #version instead of #updated_at and#published_at. (#39)