Update docs to mention the proto3 API differences.

Fixes #15.

README.md

diff --git a/README.md b/README.md
index fa4883f..12b39c3 100644
--- a/README.md
+++ b/README.md
@@ -101,6 +101,12 @@
 	with distinguished wrapper types for each possible field value.
   - Marshal and Unmarshal are functions to encode and decode the wire format.
 
+When the .proto file specifies `syntax="proto3"`, there are some differences:
+
+  - Non-repeated fields of non-message type are values instead of pointers.
+  - Getters are only generated for message and oneof fields.
+  - Enum types do not get an Enum method.
+
 Consider file test.proto, containing
 
 ```proto

proto/lib.go

diff --git a/proto/lib.go b/proto/lib.go
index dcabe3b..6837512 100644
--- a/proto/lib.go
+++ b/proto/lib.go
@@ -70,6 +70,12 @@
 	with distinguished wrapper types for each possible field value.
   - Marshal and Unmarshal are functions to encode and decode the wire format.
 
+When the .proto file specifies `syntax="proto3"`, there are some differences:
+
+  - Non-repeated fields of non-message type are values instead of pointers.
+  - Getters are only generated for message and oneof fields.
+  - Enum types do not get an Enum method.
+
 The simplest way to describe this is to see an example.
 Given file test.proto, containing