[Java] Upgrade to hamcrest 2.1.

Author: mjpt777

build.gradle

@@ -139,9 +139,9 @@ subprojects {
 
         compile 'org.agrona:agrona:1.0.0'
 
-        testCompile 'junit:junit:4.12'
+        testCompile 'org.hamcrest:hamcrest:2.1'
         testCompile 'org.mockito:mockito-core:2.27.0'
-        testCompile 'org.hamcrest:hamcrest-library:1.3'
+        testCompile 'junit:junit:4.12'
     }
 
     checkstyle {

sbe-tool/src/test/java/uk/co/real_logic/sbe/generation/java/JavaGeneratorTest.java

@@ -33,7 +33,7 @@
 import java.nio.ByteOrder;
 import java.util.Map;
 
-import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.greaterThan;
 import static org.hamcrest.Matchers.hasToString;
 import static org.hamcrest.Matchers.startsWith;

sbe-tool/src/test/java/uk/co/real_logic/sbe/generation/java/SchemaExtensionTest.java

@@ -30,7 +30,7 @@
 
 import java.util.Map;
 
-import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.Matchers.is;
 import static org.junit.Assert.*;
 import static uk.co.real_logic.sbe.generation.java.ReflectionUtil.get;
 import static uk.co.real_logic.sbe.generation.java.ReflectionUtil.set;

sbe-tool/src/test/java/uk/co/real_logic/sbe/generation/rust/RustGeneratorTest.java

@@ -14,7 +14,7 @@
 import java.util.Optional;
 import java.util.concurrent.TimeUnit;
 
-import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.Matchers.containsString;
 import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 import static uk.co.real_logic.sbe.generation.rust.RustTest.minimalDummyIr;