console.c: fix unit of min

* ext/io/console/console.c (rawmode_opt): min is minimum characters,
  not tenths.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39029 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_io_console.rb: descriptive assertions

* test/io/console/test_io_console.rb (test_stringio_getch): use more
  descriptive assertions.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39030 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
io-console.gemspec: bump

* ext/io/console/io-console.gemspec: bump.  [Bug #7762]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39031 b2dd03c8-39d4-4d8f-98ff-823fe69b080e