Mention Kernel#format as an alternative to Kernel#sprintf
less gender-specific reference in the opening paragraph

Rather than "fine fellows," which implies a boys' club, how about a slightly more inclusive alliteration? "Crafty coders" perhaps?
Remove unneeded semicolon
Avoid the use of `attr`
Mention safe assignment in condition
Mention Comparable#between?
fixed typo
Merge pull request #191 from ma2gedev/master

Fixed typo
Fix a typo
Update README.md

Fix typo in Percent Literals
Merge pull request #197 from RunsFor/master

Typo in Percent Literals
added fetch with blocks condition

blocks are lazy evaluated while the default value (provided as second argument) is eagerly evaluated
just a quick typo fix
Merge pull request #199 from trliner/master

just a quick typo fix
further refinement of opening paragraph
updated as per PR comments
Merge pull request #198 from dragosmiron/fetch-with-blocks

added fetch with blocks condition
style fix
Merge pull request #203 from dragosmiron/patch-1

style fix
Merge pull request #188 from drewda/patch-1

less gender-specific reference in the opening paragraph