Install Pod error

Help got this error when installing pod

```
[!] /bin/bash -c
set -e
pushd CBitcoin
rm -rf Frameworks/
unzip -o -q Frameworks.zip
popd

~/Library/Caches/CocoaPods/Pods/Release/CBitcoin/0.2.2-8c3a2/CBitcoin ~/Library/Caches/CocoaPods/Pods/Release/CBitcoin/0.2.2-8c3a2
[Frameworks.zip]
End-of-central-directory signature not found. Either this file is not
a zipfile, or it constitutes one disk of a multi-part archive. In the
latter case the central directory and zipfile comment will be found on
the last disk(s) of this archive.
unzip: cannot find zipfile directory in one of Frameworks.zip or
Frameworks.zip.zip, and cannot find Frameworks.zip.ZIP, period.
```

Start by reproducing the CocoaPods installation failure and inspect the CBitcoin/Frameworks.zip artifact referenced in the error. Confirm whether the archive can be retrieved and unpacked successfully, then verify that the pod installation completes without the reported unzip error.

Scritto dal modello di indicizzazione a partire dal testo della issue.