Update Core version to 4.0.3 (#92)

Author: paulb777

Firebase/Core/FIROptions.m

@@ -42,7 +42,7 @@
 NSString *const kFIRLibraryVersionID =
     @"4"     // Major version (one or more digits)
     @"00"    // Minor version (exactly 2 digits)
-    @"02"    // Build number (exactly 2 digits)
+    @"03"    // Build number (exactly 2 digits)
     @"000";  // Fixed "000"
 // Plist file name.
 NSString *const kServiceInfoFileName = @"GoogleService-Info";

Firebase/Core/FirebaseCore.podspec

@@ -4,7 +4,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'FirebaseCore'
-  s.version          = '4.0.0'
+  s.version          = '4.0.3'
   s.summary          = 'Firebase Open Source Libraries for iOS.'
 
   s.description      = <<-DESC