create_bundle error when we do git submodule

[jiangyancong]

Hi,chiunam

I follow the SUBMODULES-NOTES.md
guide to integrate CTAssetsPicker into my project.
But I met an error in create_bundle. Please have a look and let me know how to fix the issue or create bundle in other way. Thank you very much.
CTAssetsPickerController$ ls
CTAssetsPickerController README.md
CTAssetsPickerController.podspec RELEASE-NOTES.md
CTAssetsPickerDemo Resources
CTAssetsPickerDemo.xcodeproj SUBMODULES-NOTES.md
CTAssetsPickerDemo.xcworkspace Screenshot.png
LICENSE create_bundle
Podfile
CTAssetsPickerController$ ./create_bundle
./create_bundle:21:in eval': undefined methodversion' for #Pod::Spec:0x007fee8a8332b0 (NoMethodError)
from (eval):18:in block in <main>' from ./create_bundle:11:ininitialize'
from (eval):1:in new' from (eval):1:in

'
from ./create_bundle:21:in eval' from ./create_bundle:21:in'
CTAssetsPickerController$

[1and2papa]

@jiangyancong I've updated the cocopodspec file and it should be working now.