Update for xcode 9

Author: Endo

ios/RNPdfScanner.podspec

@@ -13,7 +13,7 @@ Pod::Spec.new do |s|
   s.source         = { :git => 'https://github.com/Michaelvilleneuve/react-native-document-scanner.git', :tag => s.version }
 
   s.requires_arc   = true
-  s.platform       = :ios, '7.0'
+  s.platform       = :ios, '8.0'
 
   s.preserve_paths = 'README.md', 'package.json', 'index.js'
   s.source_files   = '*.{h,m}'

ios/RNPdfScannerManager.h

@@ -1,17 +1,7 @@
 
-#if __has_include("RCTBridgeModule.h")
-#import "RCTBridgeModule.h"
-#else
 #import <React/RCTBridgeModule.h>
-#endif
 
-#if __has_include(<React/RCTViewManager.h>)
 #import <React/RCTViewManager.h>
-#elif __has_include("RCTViewManager.h")
-#import "RCTViewManager.h"
-#else
-#import "React/RCTViewManager.h"
-#endif
 
 @interface RNPdfScannerManager : RCTViewManager <RCTBridgeModule>