#203 compatible for old grpc version

Signed-off-by: gaattc <gaattc000@gmail.com>

Author: GAATTC0

spring-grpc-core/src/main/java/org/springframework/grpc/client/BlockingStubFactory.java

@@ -20,8 +20,9 @@
 public class BlockingStubFactory extends AbstractStubFactory<AbstractBlockingStub<?>> {
 
 	public static boolean supports(Class<?> type) {
-		return AbstractStubFactory.supports(AbstractBlockingStub.class, type)
-				&& !type.getSimpleName().contains("BlockingV2");
+        return (AbstractStubFactory.supports(AbstractBlockingStub.class, type) && !type.getSimpleName().contains("BlockingV2"))
+                // compatible for old grpc version
+                || type.getSimpleName().endsWith("BlockingStub");
 	}
 
 	@Override