Bump swift_version to 5.0 on RNTAztecView podspec

Author: etoledom

RNTAztecView.podspec

@@ -14,9 +14,9 @@ Pod::Spec.new do |s|
   s.public_header_files = 'react-native-aztec/ios/RNTAztecView/*.h'
   s.requires_arc     = true
   s.platforms        = { :ios => "11.0" }
-  s.swift_version    = '4.2'
+  s.swift_version    = '5.0'
   s.xcconfig         = {'OTHER_LDFLAGS' => '-lxml2',
-						'HEADER_SEARCH_PATHS' => '$(SDKROOT)/usr/include/libxml2'}
+                        'HEADER_SEARCH_PATHS' => '/usr/include/libxml2'}
   s.dependency         'React-Core'
   s.dependency         'WordPress-Aztec-iOS'