Bump patch version number

Author: diogob

postgres-copy.gemspec

@@ -5,7 +5,7 @@ $:.unshift lib unless $:.include?(lib)
 
 Gem::Specification.new do |s|
   s.name                  = "postgres-copy"
-  s.version               = "1.6.0"
+  s.version               = "1.6.1"
   s.platform              = Gem::Platform::RUBY
   s.required_ruby_version = ">= 1.9.3"
   s.authors               = ["Diogo Biazus"]