upgrade yard to ~> 0.9.11 per GitHub security warning

Author: Li Lin

Gemfile.lock

@@ -109,7 +109,7 @@ GEM
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff
-    yard (0.8.7.6)
+    yard (0.9.12)
 
 PLATFORMS
   java
@@ -132,7 +132,7 @@ DEPENDENCIES
   sqlite3
   vcr (~> 3.0)
   webmock
-  yard (~> 0.8)
+  yard (~> 0.9.11)
 
 BUNDLED WITH
-   1.13.6
+   1.16.1

convertlabsdk.gemspec

@@ -40,7 +40,7 @@ Gem::Specification.new do |s|
     s.add_development_dependency('minitest', ['>= 0'])
     s.add_development_dependency('minitest-profile', ['>= 0'])
     s.add_development_dependency('minitest-reporters', ['>= 0'])
-    s.add_development_dependency('yard', ['~> 0.8'])
+    s.add_development_dependency('yard', ['~> 0.9.11'])
     s.add_development_dependency('bundler', ['~> 1.0'])
     s.add_development_dependency('simplecov', ['>= 0'])
     s.add_development_dependency('rubocop', ['>= 0'])