Bump version to 3.1

queue_classic.gemspec

@@ -2,7 +2,7 @@
 Gem::Specification.new do |s|
   s.name          = "queue_classic"
   s.email         = "r@32k.io"
-  s.version       = "3.1.0.RC1"
+  s.version       = "3.1.0"
   s.description   = "queue_classic is a queueing library for Ruby apps. (Rails, Sinatra, Etc...) queue_classic features asynchronous job polling, database maintained locks and no ridiculous dependencies. As a matter of fact, queue_classic only requires pg."
   s.summary       = "Simple, efficient worker queue for Ruby & PostgreSQL."
   s.authors       = ["Ryan Smith (♠ ace hacker)"]