[pod ipc] Fixes issue where ipc commands would fail

Closes #3134

CHANGELOG.md

@@ -70,6 +70,11 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [Adriano Bonat](https://github.com/tanob)
   [#3117](https://github.com/CocoaPods/CocoaPods/issues/3117)
 
+* Fixes an issue where `pod ipc list` and `pod ipc podfile` was returning an
+  error.  
+  [Kyle Fuller](https://github.com/kylef)
+  [#3134](https://github.com/CocoaPods/CocoaPods/issues/3134)
+
 
 ## 0.36.0.beta.2
 

lib/cocoapods/command/inter_process_communication.rb

@@ -54,6 +54,7 @@ module Pod
         end
 
         def run
+          require 'yaml'
           podfile = Pod::Podfile.from_file(@path)
           output_pipe.puts podfile.to_yaml
         end
@@ -77,6 +78,7 @@ module Pod
         DESC
 
         def run
+          require 'yaml'
           sets = SourcesManager.aggregate.all_sets
           result = {}
           sets.each do |set|