fixed a couple of fenced blocks
quick typo fix

line 465 "...themselves - it this code really readable..."
Changed "it" to "is".
added a rule about the use of rescue as a modifier
suggest the use of fetch for hash keys that must be present
added an advice about big numeric literals
fixed syntax highlighting of the rescue modifier example
added a link to a Chinese translation of the guide
mention the Chinese Traditional translation as well
fixed a typo
Issue #128 white line after public/protected/private
'fewer than 80 characters' should be 'up to'
added an advice about flat_map
mentioned rubocop
Improve English idiom. Also fix a few errors.
added a title quotation to the regex section of the guide
nested the Annotations section under comments
fix #132 - fail is a method, not a keyword
Fix #139 - mention French translation of the guide
Extra tick in 'Perl-style special variables' line.
Fix #144 - don't use the return value of = in conditional expressions