Update CHANGELOG

CHANGELOG.md

+## 0.17.1
+[CocoaPods](https://github.com/CocoaPods/CocoaPods/compare/0.17.0...0.17.1)
+• [cocoapods-core](https://github.com/CocoaPods/Core/compare/0.17.0...0.17.1)
+
+###### Bug fixes
+
+* Always create the CACHE_ROOT directory when performing a search.
+  [#917](https://github.com/CocoaPods/CocoaPods/issues/917)
+
 ## 0.17.0
 [CocoaPods](https://github.com/CocoaPods/CocoaPods/compare/0.17.0.rc7...0.17.0)
 • [cocoapods-core](https://github.com/CocoaPods/Core/compare/0.17.0.rc7...0.17.0)

Rakefile

@@ -79,7 +79,7 @@ namespace :gem do
 
     require 'date'
 
-    # First check if the required Xcodeproj gem has been pushed
+    # First check if the required gems have been pushed
     gem_spec = eval(File.read(File.expand_path('../cocoapods.gemspec', __FILE__)))
     gem_names = ['xcodeproj', 'cocoapods-core', 'cocoapods-downloader', 'claide']
     gem_names.each do |gem_name|