Update to 0.9.0 causes include in sourceSets to be ignored

[yu-shiba]

When using 0.9.0 and building a project with sourceSets specified, includes are ignored and the following error occurs

* What went wrong:
Execution failed for task ':generateProto'.
> protoc: stdout: . stderr: [libprotobuf WARNING T:\src\github\protobuf\src\google\protobuf\compiler\parser.cc:562] No syntax specified for the proto file: test.yml. Please use 'syntax = "proto2";' or 'syntax = "proto3";' to specify a syntax version. (Defaulted to proto2 syntax.)
  test.yml:1:1: Expected top-level statement (e.g. "message").

Reproduction method

git clone https://github.com/google/protobuf-gradle-plugin.git
cd protobuf-gradle-plugin/examples/exampleProject
sed -i 's/0\.8\.19/0.9.0/' build.gradle
cat << EOS >> build.gradle
sourceSets {
    main {
        proto {
            srcDir('src/main/proto')
        }
    }
}
EOS
echo "foo" > src/main/proto/test.yml
gradle build

[rougsig]

Will fix in couple days.

[ejona86]

Fixed by #621

[ejona86]

0.9.1 is released with the fix for this issue.

[yu-shiba]

Thank you for handling this matter so quickly.