force the exact version of cocoapods

Gemfile

@@ -2,7 +2,8 @@ source 'https://rubygems.org'
 
 gem 'danger', :git => 'git@github.com:danger/danger.git', :branch => 'master'
 gem 'danger-swiftlint'
+gem 'cocoapods', '1.5.3'
+gem 'fastlane'
 
-gem "fastlane"
 plugins_path = File.join(File.dirname(__FILE__), 'fastlane', 'Pluginfile')
 eval_gemfile(plugins_path) if File.exist?(plugins_path)

README.md

@@ -33,7 +33,7 @@ Building the code
     ```
 1. Install [cocoadpods](https://cocoapods.org/)
     ```shell
-    sudo gem install cocoapods
+    bundle install
     ```
 1. Fork the repository https://github.com/ghostery/browser-ios
 1. Clone the forked repository:
@@ -46,7 +46,7 @@ Building the code
     sh ./bootstrap.sh
     npm install
     npm run bundle
-    pod install
+    bundle exec pod install
     ```
 1. Open `Client.xcworkspace` in Xcode.
 1. Build the `Fennec` scheme in Xcode.
@@ -96,4 +96,4 @@ npm run build
 ### Commits
 * Each commit should have a single clear purpose. If a commit contains multiple unrelated changes, those changes should be split into separate commits.
 * If a commit requires another commit to build properly, those commits should be squashed.
-* Follow-up commits for any review comments should be squashed. Do not include "Fixed PR comments", merge commits, or other "temporary" commits in pull requests.
+* Follow-up commits for any review comments should be squashed. Do not include "Fixed PR comments", merge commits, or other "temporary" commits in pull requests.