Merge pull request #796 from jcanizales/add-missing-comma

Fix podspec by adding missing comma
diff --git a/Protobuf.podspec b/Protobuf.podspec
index 5cfc02b..698583b 100644
--- a/Protobuf.podspec
+++ b/Protobuf.podspec
@@ -21,7 +21,7 @@
                    'objectivec/google/protobuf/SourceContext.pbobjc.{h,m}',
                    'objectivec/google/protobuf/Struct.pbobjc.{h,m}',
                    'objectivec/google/protobuf/Timestamp.pbobjc.h',
-                   'objectivec/google/protobuf/Type.pbobjc.{h,m}'
+                   'objectivec/google/protobuf/Type.pbobjc.{h,m}',
                    'objectivec/google/protobuf/Wrappers.pbobjc.{h,m}'
   # Timestamp.pbobjc.m and Duration.pbobjc.m are #imported by GPBWellKnownTypes.m. So we can't
   # compile them (duplicate symbols), but we need them available for the importing: