chore: prepare for 0.15.2

CHANGELOG.md

 ## Release Notes
 
-### Next
+### next
+
+### 0.15.2
 
 * Fix crash on `getFreeDiskStorage` and `getTotalDiskCapacity` from invalid filesystem path (https://github.com/rebeccahughes/react-native-device-info/issues/320)
 

RNDeviceInfo.podspec

 Pod::Spec.new do |s|
   s.name         = "RNDeviceInfo"
-  s.version      = "0.15.1"
+  s.version      = "0.15.2"
   s.summary      = "Device Information for react-native"
 
   s.homepage     = "https://github.com/rebeccahughes/react-native-device-info"