Upgrade qiniu version to 6.9

Gemfile.lock

@@ -3,7 +3,7 @@ PATH
   specs:
     paperclip-qiniu (0.2.0)
       paperclip
-      qiniu (~> 6.4.1)
+      qiniu (~> 6.9.0)
 
 GEM
   remote: https://rubygems.org/
@@ -33,7 +33,7 @@ GEM
       activesupport (>= 3.0.0)
       cocaine (~> 0.5.3)
       mime-types
-    qiniu (6.4.1)
+    qiniu (6.9.0)
       json (~> 1.7)
       mime-types (~> 2.4.3)
       rest-client (~> 1.6)

paperclip-qiniu.gemspec

@@ -15,6 +15,6 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
   gem.version       = Paperclip::Qiniu::VERSION
   gem.add_dependency 'paperclip'
-  gem.add_dependency 'qiniu', '~> 6.4.1'
+  gem.add_dependency 'qiniu', '~> 6.9.0'
   gem.add_development_dependency 'rspec'
 end