Update docs for 0.8.1 (#134)

Author: pcj

README.md

@@ -92,7 +92,7 @@ language-specific `*_proto_repositories` rule(s):
 git_repository(
   name = "org_pubref_rules_protobuf",
   remote = "https://github.com/pubref/rules_protobuf",
-  tag = "v0.8.0",
+  tag = "v0.8.1",
   #commit = "..." # alternatively, use latest commit on master
 )
 

go/README.md

@@ -129,6 +129,21 @@ func main() {
 The preferred strategy is to use the magic token `go_default_library`.
 When this name is chosen, part 3 is not needed and should be omitted.
 
+## Using the `importpath` attribute in `go_proto_library`
+
+The preferred approach is now done explicitly via the `importpath`
+attribute provided by `rules_go`.  See example below (details in
+[tests/custom_go_importpath](tests/custom_go_importpath)).
+
+```
+go_proto_library(
+    name = "api_proto",
+    importpath = "github.com/my/custom/import/path",
+    protos = ["api.proto"],
+    with_grpc = True,
+)
+```
+
 ---
 
 Consult source files in the