Updating dependency to avoid certificate verify failure errors.

tasks/gem.rake

@@ -24,7 +24,7 @@ namespace :gem do
     s.rdoc_options.concat ['--main',  'README.md']
 
     # Dependencies used in the main library
-    s.add_runtime_dependency('signet', '>= 0.3.1')
+    s.add_runtime_dependency('signet', '>= 0.3.4')
     s.add_runtime_dependency('addressable', '>= 2.2.3')
     s.add_runtime_dependency('autoparse', '>= 0.3.1')
     s.add_runtime_dependency('faraday', '~> 0.7.0')