Fix a crash wich occur with CocoaPods 0.35

`pod dependencies` was crashing with CocoaPods 0.35. This will fix this crash:

Crash log:
```
ArgumentError - wrong number of arguments (2 for 3)
/Library/Ruby/Gems/2.0.0/gems/cocoapods-core-0.35.0/lib/cocoapods-core/lockfile.rb:362:in `generate'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-dependencies-0.3.2/lib/pod/command/dependencies.rb:66:in `dependencies'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-dependencies-0.3.2/lib/pod/command/dependencies.rb:49:in `block in run'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-0.35.0/lib/cocoapods/user_interface.rb:91:in `title'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-dependencies-0.3.2/lib/pod/command/dependencies.rb:47:in `run'
/Library/Ruby/Gems/2.0.0/gems/claide-0.7.0/lib/claide/command.rb:271:in `run'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-0.35.0/lib/cocoapods/command.rb:45:in `run'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-0.35.0/bin/pod:43:in `<top (required)>'
/usr/bin/pod:23:in `load'
/usr/bin/pod:23:in `<main>'
```