Prepare for Java 2.0.1 release

see https://github.com/google/flatbuffers/pull/6658

grpc/flatbuffers-java-grpc/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>com.google.flatbuffers</groupId>
         <artifactId>flatbuffers-parent</artifactId>
-        <version>2.0.0</version>
+        <version>2.0.1</version>
     </parent>
     <artifactId>flatbuffers-java-grpc</artifactId>
     <name>${project.artifactId}</name>

grpc/pom.xml

@@ -4,7 +4,7 @@
     <groupId>com.google.flatbuffers</groupId>
     <artifactId>flatbuffers-parent</artifactId>
     <packaging>pom</packaging>
-    <version>2.0.0</version>
+    <version>2.0.1</version>
     <name>flatbuffers-parent</name>
     <description>parent pom for flatbuffers java artifacts</description>
     <properties>

grpc/tests/pom.xml

@@ -4,13 +4,13 @@
     <parent>
         <groupId>com.google.flatbuffers</groupId>
         <artifactId>flatbuffers-parent</artifactId>
-        <version>2.0.0</version>
+        <version>2.0.1</version>
     </parent>
     <artifactId>grpc-test</artifactId>
     <description>Example/Test project demonstrating usage of flatbuffers with GRPC-Java instead of protobufs
     </description>
     <properties>
-        <gRPC.version>2.0.0</gRPC.version>
+        <gRPC.version>2.0.1</gRPC.version>
     </properties>
     <dependencies>
         <dependency>

java/com/google/flatbuffers/ByteBufferReadWriteBuf.java

@@ -155,7 +155,7 @@ public class ByteBufferReadWriteBuf implements ReadWriteBuf {
 
   @Override
   public int writePosition() {
-    return ((Buffer) buffer).position();
+    return buffer.position();
   }
 
   @Override

pom.xml

@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.flatbuffers</groupId>
   <artifactId>flatbuffers-java</artifactId>
-  <version>2.0.0</version>
+  <version>2.0.1</version>
   <packaging>bundle</packaging>
   <name>FlatBuffers Java API</name>
   <description>