Bump podspec / Removed customer email text fields / Add gems note in README

**Reference:** :no_entry_sign: 

```
Validating podspec
 -> SaltEdge-iOS (1.0.1)

  - Data URL: https://raw.githubusercontent.com/CocoaPods/Specs/56e473b705cc8860d90b1706ec2173cf0f66118e/Specs/SaltEdge-iOS/1.0.1/SaltEdge-iOS.podspec.json
  - Log messages:
    - August 18th, 16:30: Push for `SaltEdge-iOS 1.0.1' initiated.
    - August 18th, 16:30: Push for `SaltEdge-iOS 1.0.1' has been pushed (1.101184123 s).
```