fix: fix unexpected end-of-input error (#2)

plugins/fastlane-plugin-ios_cd/lib/fastlane/plugin/ios_cd/helper/ios_cd_helper.rb

@@ -58,7 +58,7 @@ module Fastlane
 
       # Parse credential file
       def parseIosCredentials(ios_directory)
-        if File.exists?("#{ios_directory}/ios_crendentials.json")
+        if File.exist?("#{ios_directory}/ios_crendentials.json")
           # Read file and decrypt it
           file = File.read("#{ios_directory}/ios_crendentials.json")
           JSON.parse(file)
@@ -69,4 +69,5 @@ module Fastlane
         end
       end
     end
+  end
 end