README: fix typo (#379)
diff --git a/README.md b/README.md
index 828ebbc..56c8953 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@
repo. The packages here contain types specifically for interacting with Google
APIs.
-Historically, the pacakges in the `protobuf` directory used to contain
+Historically, the packages in the `protobuf` directory used to contain
generated code for certain well-known types hosted by [google/protobuf][3].
These types are now hosted by the [`google.golang.org/protobuf`][4] module
and type aliases are used to forward declarations in this module over to