Updated readme.

Author: aksh1t

README.md

@@ -216,7 +216,7 @@ adb push /path/to/your/document.pdf /sdcard/document.pdf
  - Xcode 12
  - PSPDFKit 10.0.0 for iOS or later
  - Flutter 1.21.0-9.2.pre or later
- - CocoaPods 1.10.0.rc.1 or later
+ - CocoaPods 1.10.0.rc.1 or later (Update cocoapods with: `gem install cocoapods -v 1.10.0.rc.1`)
 
 #### Getting Started